* subversion/include/svn_wc.h
  (svn_wc_get_update_editor4): Document the 'clean_checkout' parameter.

* subversion/include/private/svn_wc_private.h
  (svn_wc__get_update_editor): Same.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1455754 13f79535-47bb-0310-9956-ffa450edef68