* subversion/libsvn_diff/diff_file.c   (svn_diff__file_baton_t, datasource_open): Add comments.
* subversion/libsvn_diff/diff_file.c
  (svn_diff__file_baton_t, datasource_open): Add comments.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1021722 13f79535-47bb-0310-9956-ffa450edef68

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