man: fix links to external man pages

linkchecker ftw!

man/less-variables.xml

@@ -12,8 +12,8 @@
       <listitem><para>Pager to use when <option>--no-pager</option> is not given; overrides
       <varname>$PAGER</varname>. If neither <varname>$SYSTEMD_PAGER</varname> nor <varname>$PAGER</varname> are set, a
       set of well-known pager implementations are tried in turn, including
-      <citerefentry><refentrytitle>less</refentrytitle><manvolnum>1</manvolnum></citerefentry> and
+      <citerefentry project='man-pages'><refentrytitle>less</refentrytitle><manvolnum>1</manvolnum></citerefentry> and
-      <citerefentry><refentrytitle>more</refentrytitle><manvolnum>1</manvolnum></citerefentry>, until one is found. If
+      <citerefentry project='man-pages'><refentrytitle>more</refentrytitle><manvolnum>1</manvolnum></citerefentry>, until one is found. If
       no pager implementation is discovered no pager is invoked. Setting this environment variable to an empty string
       or the value <literal>cat</literal> is equivalent to passing <option>--no-pager</option>.</para></listitem>
     </varlistentry>

man/systemd-coredump.xml

@@ -123,7 +123,7 @@
 
     <para>In order to by used in the <option>--backtrace</option> mode, an appropriate backtrace
     handler must be installed on the sender side. For example, in case of
-    <citerefentry><refentrytitle>python</refentrytitle><manvolnum>1</manvolnum></citerefentry>, this
+    <citerefentry project='die-net'><refentrytitle>python</refentrytitle><manvolnum>1</manvolnum></citerefentry>, this
     means a <varname>sys.excepthook</varname> must installed, see
     <ulink url="https://github.com/keszybz/systemd-coredump-python">systemd-coredump-python</ulink>.
     </para>

man/systemd-mount.xml

@@ -76,7 +76,7 @@
     <replaceable>WHERE</replaceable>.</para>
 
     <para>In many ways, <command>systemd-mount</command> is similar to the lower-level
-    <citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry> command, however instead
+    <citerefentry project='man-pages'><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry> command, however instead
     of executing the mount operation directly and immediately, <command>systemd-mount</command> schedules it through
     the service manager job queue, so that it may pull in further dependencies (such as parent mounts, or a file system
     checker to execute a priori), and may make use of the auto-mounting logic.</para>
@@ -301,7 +301,7 @@
     <title>See Also</title>
     <para>
       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
-      <citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>,

man/systemd.exec.xml

@@ -1580,7 +1580,7 @@
 
         <listitem><para>Restricts access to Linux namespace functionality for the processes of this unit. For details
         about Linux namespaces, see
-        <citerefentry><refentrytitle>namespaces</refentrytitle><manvolnum>7</manvolnum></citerefentry>. Either takes a
+        <citerefentry project='man-pages'><refentrytitle>namespaces</refentrytitle><manvolnum>7</manvolnum></citerefentry>. Either takes a
         boolean argument, or a space-separated list of namespace type identifiers. If false (the default), no
         restrictions on namespace creation and switching are made. If true, access to any kind of namespacing is
         prohibited. Otherwise, a space-separated list of namespace type identifiers must be specified, consisting of

man/systemd.mount.xml

@@ -230,7 +230,7 @@
         <listitem><para>The block device backed file system will be upgraded
         to <varname>BindsTo=</varname> dependency. This option is only useful
         when mounting file systems manually with
-        <citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+        <citerefentry project='man-pages'><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>
         as the default dependency in this case is <varname>Requires=</varname>.
         This option is already implied by entries in <filename>/etc/fstab</filename>
         or by mount units.

man/systemd.network.xml

@@ -507,7 +507,7 @@
             <para>This setting is read by
             <citerefentry><refentrytitle>systemd-resolved.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
             "Search domains" correspond to the <varname>domain</varname> and <varname>search</varname> entries in
-            <citerefentry><refentrytitle>resolv.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+            <citerefentry project='man-pages'><refentrytitle>resolv.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
             Domain name routing has no equivalent in the traditional glibc API, which has no concept of domain
             name servers limited to a specific link.</para>
           </listitem>