Add doc strings to several locking-related functions and structures
in fs_base, fs_fs and fs_x.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1584604 13f79535-47bb-0310-9956-ffa450edef68
* subversion/libsvn_ra_serf/getlocks.c
  (svn_ra_serf__get_locks): Improve error handling behavior by no longer
    disabling the standard error handling, but handling the proper error
    from older mod_dav_svn versions. This will make us properly attach
    the server error to the error chain.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1584606 13f79535-47bb-0310-9956-ffa450edef68