Fix a doc string. A follow-up to r31978.
Fix a doc string. A follow-up to r31978.

* subversion/svnlook/main.c
  (do_plist): Document the new argument "xml".

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion