Follow-up to r23575.
Follow-up to r23575.

* subversion/include/svn_error_codes.h
  (SVN_ERR_RA_SVN_NO_MECHANISMS): Add '@since' docstring.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@863825 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion