(svn_io_file_reader, svn_io_file_writer): include clarification, with thanks to Greg Stein.
(svn_io_file_reader, svn_io_file_writer): include clarification, with
thanks to Greg Stein.

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