svnpubsub: make some commented-out examples more robust.

[in tools/server-side/svnpubsub]
* server.py
  (example comments): Escape arguments containing * and align the rest.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1486514 13f79535-47bb-0310-9956-ffa450edef68