* subversion/svnserve/serve.c   (change_rev_prop, log_cmd): Document some irregularities in the    tuple parsing idiom used for optional arguments.
* subversion/svnserve/serve.c
  (change_rev_prop, log_cmd): Document some irregularities in the
   tuple parsing idiom used for optional arguments.

Found by: ghudson

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