nixos/*: replace <replaceable>s with «thing»

we can't embed syntactic annotations of this kind in markdown code
blocks without yet another extension. replaceable is rare enough to make
this not much worth it, so we'll go with «thing» instead. the module
system already uses this format for its placeholder names in attrsOf
paths.

nixos/modules/config/users-groups.nix

···
           automatically sets <option>group</option> to
           <literal>users</literal>, <option>createHome</option> to
           <literal>true</literal>, <option>home</option> to
-          <filename>/home/<replaceable>username</replaceable></filename>,
+          <filename>/home/«username»</filename>,
           <option>useDefaultShell</option> to <literal>true</literal>,
           and <option>isSystemUser</option> to
           <literal>false</literal>.

nixos/modules/hardware/video/uvcvideo/default.nix

···
         description = ''
           List of packages containing <command>uvcvideo</command> dynamic controls
           rules. All files found in
-          <filename><replaceable>pkg</replaceable>/share/uvcdynctrl/data</filename>
+          <filename>«pkg»/share/uvcdynctrl/data</filename>
           will be included.
 
           Note that these will serve as input to the <command>libwebcam</command>

nixos/modules/programs/neovim.nix

···
       '';
       description = ''
         Generate your init file from your list of plugins and custom commands.
-        Neovim will then be wrapped to load <command>nvim -u /nix/store/<replaceable>hash</replaceable>-vimrc</command>
+        Neovim will then be wrapped to load <command>nvim -u /nix/store/«hash»-vimrc</command>
       '';
     };
 

nixos/modules/security/dhparams.nix

···
 
           The value is the size (in bits) of the DH params to generate. The
           generated DH params path can be found in
-          <literal>config.security.dhparams.params.<replaceable>name</replaceable>.path</literal>.
+          <literal>config.security.dhparams.params.«name».path</literal>.
 
           <note><para>The name of the DH params is taken as being the name of
           the service it serves and the params will be generated before the

nixos/modules/services/backup/duplicity.nix

···
         <citerefentry><refentrytitle>systemd.exec</refentrytitle>
         <manvolnum>5</manvolnum></citerefentry>. For example:
         <programlisting>
-        PASSPHRASE=<replaceable>...</replaceable>
-        AWS_ACCESS_KEY_ID=<replaceable>...</replaceable>
-        AWS_SECRET_ACCESS_KEY=<replaceable>...</replaceable>
+        PASSPHRASE=«...»
+        AWS_ACCESS_KEY_ID=«...»
+        AWS_SECRET_ACCESS_KEY=«...»
         </programlisting>
       '';
     };

nixos/modules/services/backup/syncoid.nix

···
             example = "user@server:pool/dataset";
             description = ''
               Target ZFS dataset. Can be either local
-              (<replaceable>pool/dataset</replaceable>) or remote
-              (<replaceable>user@server:pool/dataset</replaceable>).
+              («pool/dataset») or remote
+              («user@server:pool/dataset»).
             '';
           };
 

nixos/modules/services/hardware/udev.nix

···
         description = ''
           List of packages containing <command>udev</command> rules.
           All files found in
-          <filename><replaceable>pkg</replaceable>/etc/udev/rules.d</filename> and
-          <filename><replaceable>pkg</replaceable>/lib/udev/rules.d</filename>
+          <filename>«pkg»/etc/udev/rules.d</filename> and
+          <filename>«pkg»/lib/udev/rules.d</filename>
           will be included.
         '';
         apply = map getBin;
···
 
           List of packages containing <command>udev</command> rules that will be copied to stage 1.
           All files found in
-          <filename><replaceable>pkg</replaceable>/etc/udev/rules.d</filename> and
-          <filename><replaceable>pkg</replaceable>/lib/udev/rules.d</filename>
+          <filename>«pkg»/etc/udev/rules.d</filename> and
+          <filename>«pkg»/lib/udev/rules.d</filename>
           will be included.
         '';
       };

nixos/modules/services/mail/sympa.nix

···
         description = ''
           The webserver used for the Sympa web interface. Set it to `none` if you want to configure it yourself.
           Further nginx configuration can be done by adapting
-          <option>services.nginx.virtualHosts.<replaceable>name</replaceable></option>.
+          <option>services.nginx.virtualHosts.«name»</option>.
         '';
       };
 

nixos/modules/services/networking/hans.nix

···
           Each attribute of this option defines a systemd service that
           runs hans. Many or none may be defined.
           The name of each service is
-          <literal>hans-<replaceable>name</replaceable></literal>
-          where <replaceable>name</replaceable> is the name of the
+          <literal>hans-«name»</literal>
+          where «name» is the name of the
           corresponding attribute name.
         '';
         example = literalExpression ''

nixos/modules/services/networking/iodine.nix

···
           Each attribute of this option defines a systemd service that
           runs iodine. Many or none may be defined.
           The name of each service is
-          <literal>iodine-<replaceable>name</replaceable></literal>
-          where <replaceable>name</replaceable> is the name of the
+          <literal>iodine-«name»</literal>
+          where «name» is the name of the
           corresponding attribute name.
         '';
         example = literalExpression ''

nixos/modules/services/networking/openvpn.nix

···
         Each attribute of this option defines a systemd service that
         runs an OpenVPN instance.  These can be OpenVPN servers or
         clients.  The name of each systemd service is
-        <literal>openvpn-<replaceable>name</replaceable>.service</literal>,
-        where <replaceable>name</replaceable> is the corresponding
+        <literal>openvpn-«name».service</literal>,
+        where «name» is the corresponding
         attribute name.
       '';
 

nixos/modules/services/system/dbus.nix

···
           the configuration of the D-Bus system-wide or session-wide
           message bus.  Specifically, files in the following directories
           will be included into their respective DBus configuration paths:
-          <filename><replaceable>pkg</replaceable>/etc/dbus-1/system.d</filename>
-          <filename><replaceable>pkg</replaceable>/share/dbus-1/system.d</filename>
-          <filename><replaceable>pkg</replaceable>/share/dbus-1/system-services</filename>
-          <filename><replaceable>pkg</replaceable>/etc/dbus-1/session.d</filename>
-          <filename><replaceable>pkg</replaceable>/share/dbus-1/session.d</filename>
-          <filename><replaceable>pkg</replaceable>/share/dbus-1/services</filename>
+          <filename>«pkg»/etc/dbus-1/system.d</filename>
+          <filename>«pkg»/share/dbus-1/system.d</filename>
+          <filename>«pkg»/share/dbus-1/system-services</filename>
+          <filename>«pkg»/etc/dbus-1/session.d</filename>
+          <filename>«pkg»/share/dbus-1/session.d</filename>
+          <filename>«pkg»/share/dbus-1/services</filename>
         '';
       };
 

nixos/modules/services/web-servers/apache-httpd/vhost-options.nix

···
       default = false;
       description = ''
         Whether to enable serving <filename>~/public_html</filename> as
-        <literal>/~<replaceable>username</replaceable></literal>.
+        <literal>/~«username»</literal>.
       '';
     };
 

nixos/modules/system/boot/luksroot.nix

···
         The encrypted disk that should be opened before the root
         filesystem is mounted. Both LVM-over-LUKS and LUKS-over-LVM
         setups are supported. The unencrypted devices can be accessed as
-        <filename>/dev/mapper/<replaceable>name</replaceable></filename>.
+        <filename>/dev/mapper/«name»</filename>.
       '';
 
       type = with types; attrsOf (submodule (

nixos/modules/system/boot/stage-1.nix

···
         if you want to resume from file. If left empty, the swap partitions are used.
         Specify here the device where the file resides.
         You should also use <varname>boot.kernelParams</varname> to specify
-        <literal><replaceable>resume_offset</replaceable></literal>.
+        <literal>«resume_offset»</literal>.
       '';
     };
 

nixos/modules/system/boot/systemd/tmpfiles.nix

···
         List of packages containing <command>systemd-tmpfiles</command> rules.
 
         All files ending in .conf found in
-        <filename><replaceable>pkg</replaceable>/lib/tmpfiles.d</filename>
+        <filename>«pkg»/lib/tmpfiles.d</filename>
         will be included.
         If this folder does not exist or does not contain any files an error will be returned instead.
 

nixos/modules/virtualisation/nixos-containers.nix

···
                 Whether to give the container its own private virtual
                 Ethernet interface.  The interface is called
                 <literal>eth0</literal>, and is hooked up to the interface
-                <literal>ve-<replaceable>container-name</replaceable></literal>
+                <literal>ve-«container-name»</literal>
                 on the host.  If this option is not set, then the
                 container shares the network interfaces of the host,
                 and can bind to any port on any interface.
···
       description = ''
         A set of NixOS system configurations to be run as lightweight
         containers.  Each container appears as a service
-        <literal>container-<replaceable>name</replaceable></literal>
+        <literal>container-«name»</literal>
         on the host system, allowing it to be started and stopped via
         <command>systemctl</command>.
       '';

nixos/modules/virtualisation/qemu-vm.nix

···
         description =
           ''
             Virtual networks to which the VM is connected.  Each
-            number <replaceable>N</replaceable> in this list causes
+            number «N» in this list causes
             the VM to have a virtual Ethernet interface attached to a
             separate virtual network on which it will be assigned IP
             address
-            <literal>192.168.<replaceable>N</replaceable>.<replaceable>M</replaceable></literal>,
-            where <replaceable>M</replaceable> is the index of this VM
+            <literal>192.168.«N».«M»</literal>,
+            where «M» is the index of this VM
             in the list of VMs.
           '';
       };