man: correct version information when $REMOTE_ADDR/$REMOTE_PORT where added

This was in commit 3b1c524, i.e. in the
v220 cycle.

(cherry picked from commit 3bdcd99)
(cherry picked from commit 89b4f52775fdd455990a54094bf61d5f71c7d4ed)
(cherry picked from commit f9f66bef6d98e7bab1ff27ed268ec529f2ef205f)

Author: poettering

man/systemd.exec.xml

@@ -4096,7 +4096,7 @@ StandardInputData=V2XigLJyZSBubyBzdHJhbmdlcnMgdG8gbG92ZQpZb3Uga25vdyB0aGUgcnVsZX
           unit with <varname>Accept=yes</varname>), these environment variables contain the IP address and
           port number of the remote peer of the socket connection.</para>
 
-          <xi:include href="version-info.xml" xpointer="v254"/></listitem>
+          <xi:include href="version-info.xml" xpointer="v220"/></listitem>
         </varlistentry>
 
         <varlistentry>