manual: fixed remaining placeholder literal

authored by Thomas Bach and committed by Domen Kožar f37a1e15 572726a5

+2 -2
+2 -2
nixos/doc/manual/development/option-declarations.xml
··· 137 };</screen></example> 138 139 <example xml:id='ex-option-declaration-eot-backend-sddm'><title>Extending 140 - <literal>services.foo.backend</literal> in the <literal>sddm</literal> 141 - module</title> 142 <screen> 143 services.xserver.displayManager.enable = mkOption { 144 type = with types; nullOr (enum [ "sddm" ]);
··· 137 };</screen></example> 138 139 <example xml:id='ex-option-declaration-eot-backend-sddm'><title>Extending 140 + <literal>services.xserver.displayManager.enable</literal> in the 141 + <literal>sddm</literal> module</title> 142 <screen> 143 services.xserver.displayManager.enable = mkOption { 144 type = with types; nullOr (enum [ "sddm" ]);