On the multi-layer-moves branch, update some docstrings.
On the multi-layer-moves branch, update some docstrings.

* subversion/libsvn_wc/wc-metadata.sql
  (BASE): Update docstrings related to move information.


git-svn-id: 431bda003dbfb1e8904f1a1119768f7246d9e1a8@1293106 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion