machinectl: mention -V in --help text

Follow-up for f82dcc3fc3

man/machinectl.xml

@@ -888,7 +888,6 @@
       </varlistentry>
 
       <varlistentry>
-        <term><option>-V</option></term>
         <term><option>--runner=</option><option>nspawn</option>|<option>vmspawn</option></term>
 
         <listitem><para>When operating on machines choose whether to use
@@ -900,7 +899,13 @@
         is used.
         </para>
 
-        <para><option>-V</option> is a shorthand for <option>--runner=vmspawn</option>.</para>
+        <xi:include href="version-info.xml" xpointer="v256"/></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-V</option></term>
+
+        <listitem><para><option>-V</option> is a shorthand for <option>--runner=vmspawn</option>.</para>
 
         <xi:include href="version-info.xml" xpointer="v256"/></listitem>
       </varlistentry>

src/machine/machinectl.c

@@ -2676,6 +2676,7 @@ static int help(int argc, char *argv[], void *userdata) {
                "     --now                    Start or power off container after enabling or\n"
                "                              disabling it\n"
                "     --runner=RUNNER          Select between nspawn and vmspawn as the runner\n"
+               "  -V                          Short for --runner=vmspawn\n"
                "\nSee the %2$s for details.\n",
                program_invocation_short_name,
                link,