Documentation: Fix dead URLs to ftp.kernel.org

As ftp.kernel.org is closed [0], this commit fixes dead URLs in
documents to use www.kernel.org instead.

[0] https://www.kernel.org/shutting-down-ftp-services.html

Signed-off-by: SeongJae Park <[e-mail]>
Acked-by: Theodore Ts'o <[e-mail]>
Acked-by: David S. Miller <[e-mail]>
Reviewed-by: Mauro Carvalho Chehab <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>

Documentation/early-userspace/README

···
 maintained separately from the kernel.
 
 You can obtain somewhat infrequent snapshots of klibc from
-ftp://ftp.kernel.org/pub/linux/libs/klibc/
+https://www.kernel.org/pub/linux/libs/klibc/
 
 For active users, you are better off using the klibc git
 repository, at http://git.kernel.org/?p=libs/klibc/klibc.git

Documentation/filesystems/ext4.txt

···
 	
 	or
 
-    ftp://ftp.kernel.org/pub/linux/kernel/people/tytso/e2fsprogs/
+    https://www.kernel.org/pub/linux/kernel/people/tytso/e2fsprogs/
 
 	or grab the latest git repository from:
 

Documentation/filesystems/nfs/nfs-rdma.txt

···
   - Install a Linux kernel with NFS/RDMA
 
     The NFS/RDMA client and server are both included in the mainline Linux
-    kernel version 2.6.25 and later. This and other versions of the 2.6 Linux
+    kernel version 2.6.25 and later. This and other versions of the Linux
     kernel can be found at:
 
-    ftp://ftp.kernel.org/pub/linux/kernel/v2.6/
+    https://www.kernel.org/pub/linux/kernel/
 
     Download the sources and place them in an appropriate location.
 

Documentation/networking/e100.txt

···
   version 1.6 or later is required for this functionality.
 
   The latest release of ethtool can be found from
-  http://ftp.kernel.org/pub/software/network/ethtool/
+  https://www.kernel.org/pub/software/network/ethtool/
 
   Enabling Wake on LAN* (WoL)
   ---------------------------

Documentation/networking/e1000.txt

···
   version 1.6 or later is required for this functionality.
 
   The latest release of ethtool can be found from
-  http://ftp.kernel.org/pub/software/network/ethtool/
+  https://www.kernel.org/pub/software/network/ethtool/
 
   Enabling Wake on LAN* (WoL)
   ---------------------------

Documentation/networking/e1000e.txt

···
   diagnostics, as well as displaying statistical information.  We
   strongly recommend downloading the latest version of ethtool at:
 
-  http://ftp.kernel.org/pub/software/network/ethtool/
+  https://kernel.org/pub/software/network/ethtool/
 
   NOTE: When validating enable/disable tests on some parts (82578, for example)
   you need to add a few seconds between tests when working with ethtool.

Documentation/networking/igb.txt

···
   diagnostics, as well as displaying statistical information. The latest
   version of ethtool can be found at:
 
-  http://ftp.kernel.org/pub/software/network/ethtool/
+  https://www.kernel.org/pub/software/network/ethtool/
 
   Enabling Wake on LAN* (WoL)
   ---------------------------

Documentation/networking/igbvf.txt

···
   version 3.0 or later is required for this functionality, although we
   strongly recommend downloading the latest version at:
 
-  http://ftp.kernel.org/pub/software/network/ethtool/
+  https://www.kernel.org/pub/software/network/ethtool/
 
 Support
 =======

Documentation/networking/ixgb.txt

···
   version 1.6 or later is required for this functionality.
 
   The latest release of ethtool can be found from
-  http://ftp.kernel.org/pub/software/network/ethtool/
+  https://www.kernel.org/pub/software/network/ethtool/
 
   NOTE: The ethtool version 1.6 only supports a limited set of ethtool options.
         Support for a more complete ethtool feature set can be enabled by

Documentation/networking/ixgbe.txt

···
   ethtool version is required for this functionality.
 
   The latest release of ethtool can be found from
-  http://ftp.kernel.org/pub/software/network/ethtool/
+  https://www.kernel.org/pub/software/network/ethtool/
 
   FCoE
   ----

Documentation/process/applying-patches.rst

···
 
 The 4.x.y (-stable) and 4.x patches live at
 
-	ftp://ftp.kernel.org/pub/linux/kernel/v4.x/
+	https://www.kernel.org/pub/linux/kernel/v4.x/
 
 The -rc patches live at
 
-	ftp://ftp.kernel.org/pub/linux/kernel/v4.x/testing/
-
-In place of ``ftp.kernel.org`` you can use ``ftp.cc.kernel.org``, where cc is a
-country code. This way you'll be downloading from a mirror site that's most
-likely geographically closer to you, resulting in faster downloads for you,
-less bandwidth used globally and less load on the main kernel.org servers --
-these are good things, so do use mirrors when possible.
+	https://www.kernel.org/pub/linux/kernel/v4.x/testing/
 
 
 The 4.x kernels
···
  The -stable team usually do make incremental patches available as well
  as patches against the latest mainline release, but I only cover the
  non-incremental ones below. The incremental ones can be found at
- ftp://ftp.kernel.org/pub/linux/kernel/v4.x/incr/
+ https://www.kernel.org/pub/linux/kernel/v4.x/incr/
 
 These patches are not incremental, meaning that for example the 4.7.3
 patch does not apply on top of the 4.7.2 kernel source, but rather on top

Documentation/process/changes.rst

···
 Binutils
 --------
 
-- <ftp://ftp.kernel.org/pub/linux/devel/binutils/>
+- <https://www.kernel.org/pub/linux/devel/binutils/>
 
 OpenSSL
 -------
···
 Util-linux
 ----------
 
-- <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>
+- <https://www.kernel.org/pub/linux/utils/util-linux/>
 
 Ksymoops
 --------
 
-- <ftp://ftp.kernel.org/pub/linux/utils/kernel/ksymoops/v2.4/>
+- <https://www.kernel.org/pub/linux/utils/kernel/ksymoops/v2.4/>
 
 Module-Init-Tools
 -----------------
 
-- <ftp://ftp.kernel.org/pub/linux/kernel/people/rusty/modules/>
+- <https://www.kernel.org/pub/linux/utils/kernel/module-init-tools/>
 
 Mkinitrd
 --------
···
 Pcmciautils
 -----------
 
-- <ftp://ftp.kernel.org/pub/linux/utils/kernel/pcmcia/>
+- <https://www.kernel.org/pub/linux/utils/kernel/pcmcia/>
 
 Quota-tools
 -----------