Following up on r1453925, update some comments.

* subversion/libsvn_wc/status.c
  (collect_ignore_patterns,
   send_unversioned_item,
   one_child_status): Update doc strings.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1453935 13f79535-47bb-0310-9956-ffa450edef68