Document svn_stream_open_unique.  (oops!)
Document svn_stream_open_unique.  (oops!)

Found by: hwright

* subversion/include/svn_io.h:
  (svn_stream_open_unique): document

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