Added cross-references to NixOS manual

nixos/doc/manual/configuration/ssh.xml

@@ -10,12 +10,12 @@
 setting:
 
 <programlisting>
-services.openssh.enable = true;
+<xref linkend="opt-services.openssh.enable"/> = true;
 </programlisting>
 
 By default, root logins using a password are disallowed.  They can be
 disabled entirely by setting
-<literal>services.openssh.permitRootLogin</literal> to
+<xref linkend="opt-services.openssh.permitRootLogin"/> to
 <literal>"no"</literal>.</para>
 
 <para>You can declaratively specify authorised RSA/DSA public keys for
@@ -23,7 +23,7 @@ a user as follows:
 
 <!-- FIXME: this might not work if the user is unmanaged. -->
 <programlisting>
-users.extraUsers.alice.openssh.authorizedKeys.keys =
+<link linkend="opt-users.users._name__.openssh.authorizedKeys.keys">users.extraUsers.alice.openssh.authorizedKeys.keys</link> =
   [ "ssh-dss AAAAB3NzaC1kc3MAAACBAPIkGWVEt4..." ];
 </programlisting>