Tweak doc strings.

* subversion/include/svn_fs.h
  (svn_fs_lock2, svn_fs_unlock2): Document result_pool and scratch_pool
    consistently.

* subversion/include/svn_repos.h
  (svn_repos_fs_lock2, svn_repos_fs_unlock2): Same.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1582241 13f79535-47bb-0310-9956-ffa450edef68