Clean up "svn update" code.
Clean up "svn update" code.

* subversion/svn/update-cmd.c
  (print_update_summary): Mention the array element types, and that all
    target paths must be dirents.
  (svn_cl__update): Don't pass any URL targets into svn_client_update4() or
    print_update_summary(); skip them here instead.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1040232 13f79535-47bb-0310-9956-ffa450edef68

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