* subversion/include/svn_io.h: fix typo in docstring
* subversion/include/svn_io.h: fix typo in docstring

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