Followup to r1579922, fix help string formatting for svnsync -M

* subversion/svnsync/svnsync.c
  (svnsync_cmd_table): Add trailing newline.

Obvious fix.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1600746 13f79535-47bb-0310-9956-ffa450edef68