Add doc strings.
Add doc strings.

* subversion/libsvn_wc/wc.h
  (svn_wc__internal_is_replaced, svn_wc__internal_node_get_url,
   svn_wc__internal_is_file_external, svn_wc__internal_node_get_schedule):
    Add doc strings simply referring to the equivalent external functions.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@959301 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion