Tweak a doc string.
Tweak a doc string.

* subversion/include/svn_ra.h
  (svn_ra_get_log2): Add Doxygen "@a" marker when referencing an argument.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@880476 13f79535-47bb-0310-9956-ffa450edef68

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