Minor doc string fix for svn_client__merge_path_t.
Minor doc string fix for svn_client__merge_path_t.

* subversion/libsvn_client/mergeinfo.h
  (svn_client__merge_path_t): Note that we always describe the target
  of a merge regardless of whether it has explicit mergeinfo.

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