man: create reusable snippet for 'vpick' entries

man/systemd.exec.xml

@@ -155,9 +155,7 @@
           <programlisting>BindReadOnlyPaths=/dev/log /run/systemd/journal/socket /run/systemd/journal/stdout</programlisting>
         </example>
 
-        <para>In place of the directory path a <literal>.v/</literal> versioned directory may be specified,
-        see <citerefentry><refentrytitle>systemd.v</refentrytitle><manvolnum>7</manvolnum></citerefentry> for
-        details.</para>
+        <xi:include href="vpick.xml" xpointer="directory"/>
 
         <xi:include href="system-or-user-ns.xml" xpointer="singular"/></listitem>
       </varlistentry>
@@ -195,9 +193,7 @@
         <citerefentry><refentrytitle>systemd-soft-reboot.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>),
         in case the service is configured to survive it.</para>
 
-        <para>In place of the image path a <literal>.v/</literal> versioned directory may be specified, see
-        <citerefentry><refentrytitle>systemd.v</refentrytitle><manvolnum>7</manvolnum></citerefentry> for
-        details.</para>
+        <xi:include href="vpick.xml" xpointer="image"/>
 
         <xi:include href="system-only.xml" xpointer="singular"/>