man: fix links

Found using linkchecker.
For virtiofsd, the man page is maintained upstream, but doesn't seem to be
available in any of the usual places. So let's link to the Debian version.
systemd.filter I have no idea what it is.

man/importctl.xml

@@ -340,7 +340,7 @@
         <term><option>--machine=</option></term>
 
         <listitem><para>Connect to
-        <citerefentry><refentrytitle>systemd-import.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+        <citerefentry><refentrytitle>systemd-importd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
         running in a local container, to perform the specified operation within the container.</para>
 
         <xi:include href="version-info.xml" xpointer="v256"/></listitem>

man/kernel-command-line.xml

@@ -768,7 +768,7 @@
         <term><varname>systemd.tpm2_allow_clear=</varname></term>
 
         <listitem><para>Controls whether to allow clearing of the TPM chip, implemented by
-        <citerefentry><refentrytitle>systemd-tpm2-clear</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
+        <citerefentry><refentrytitle>systemd-tpm2-clear.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 
         <xi:include href="version-info.xml" xpointer="v258"/></listitem>
       </varlistentry>

man/logind.conf.xml

@@ -419,8 +419,8 @@
                configuration knobs. -->
           <para>
             Controls whether
-            <citerefentry><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry> messages
+            <citerefentry project='die-net'><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>
-            should be sent to the terminals of all currently logged in users upon shutdown or
+            messages should be sent to the terminals of all currently logged in users upon shutdown or
             reboot. Defaults to <literal>yes</literal>, and can be changed at runtime via the DBus
             <literal>EnableWallMessages</literal> and <literal>WallMessagePrefix</literal> properties.
           </para>

man/org.freedesktop.timedate1.xml

@@ -196,8 +196,8 @@ $ gdbus introspect --system \
     <title>See Also</title>
     <para><simplelist type="inline">
       <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
-      <member><citerefentry><refentrytitle>systemd-timedate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
+      <member><citerefentry><refentrytitle>systemd-timedated.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
-      <member><citerefentry><refentrytitle>timedatectl.service</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
+      <member><citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
       <member><ulink url="https://lists.freedesktop.org/archives/systemd-devel/2011-May/002526.html">More information on how the system clock and RTC interact</ulink></member>
     </simplelist></para>
   </refsect1>

man/org.freedesktop.timesync1.xml

@@ -157,7 +157,7 @@ $ gdbus introspect --system \
     <title>See Also</title>
     <para><simplelist type="inline">
       <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
-      <member><citerefentry><refentrytitle>systemd-timesync.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
+      <member><citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
     </simplelist></para>
   </refsect1>
 </refentry>

man/systemd-dissect.xml

@@ -321,8 +321,8 @@
         specified output archive file name, e.g. any path suffixed with <literal>.tar.xz</literal> will
         result in an xz compressed UNIX tarball (if the path is omitted an uncompressed UNIX tarball is
         created). See
-        <citerefentry><refentrytitle>libarchive</refentrytitle><manvolnum>3</manvolnum></citerefentry> for a
+        <citerefentry project='die-net'><refentrytitle>libarchive</refentrytitle><manvolnum>3</manvolnum></citerefentry>
-        list of supported archive formats and compression schemes.</para>
+        for a list of supported archive formats and compression schemes.</para>
 
         <xi:include href="version-info.xml" xpointer="v256"/></listitem>
       </varlistentry>

man/systemd-vmspawn.xml

@@ -413,7 +413,7 @@
 
           <listitem><para>Controls user namespacing under <option>--directory=</option>.
           If enabled,
-          <citerefentry><refentrytitle>virtiofsd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+          <citerefentry project='url'><refentrytitle url='https://manpages.debian.org/unstable/qemu-system-common/virtiofsd.1.en.html'>virtiofsd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
           is instructed to map user and group ids (UIDs and GIDs).
           This involves mapping the private UIDs/GIDs used in the virtual machine (starting with the virtual machine's
           root user 0 and up) to a range of UIDs/GIDs on the host that are not used for other purposes (usually in the

man/systemd.image-policy.xml

@@ -185,7 +185,6 @@
       <member><citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
       <member><citerefentry><refentrytitle>systemd-sysext</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
       <member><citerefentry><refentrytitle>systemd-analyze</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
-      <member><citerefentry><refentrytitle>systemd.filter</refentrytitle><manvolnum>7</manvolnum></citerefentry></member>
     </simplelist></para>
   </refsect1>
 

man/systemd.system-credentials.xml

@@ -500,7 +500,7 @@
           <filename>/etc/userdb/foobar.group</filename>. Symlinks for the uid/gid will also be created in
           <filename>/etc/userdb/</filename>, as well as the corresponding<filename>.membership</filename>
           files. See
-          <citerefentry><refentrytitle>systemd-userdb</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+          <citerefentry><refentrytitle>systemd-userdbd.service</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
           <citerefentry><refentrytitle>nss-systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>, and
           <citerefentry><refentrytitle>userdbctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
           for details.</para>