* subversion/include/svn_error.h
  (svn_error_root_cause): Document that the returned error should not
    be cleared, just like in svn_error_find_cause.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1585921 13f79535-47bb-0310-9956-ffa450edef68