SWIG: Tweak description of mapping file.
SWIG: Tweak description of mapping file.

* subversion/bindings/swig/include/svn_types.swg
  Tweak wording of file description.

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