[MERGE] Minor docstring cleanups

[Martin Pool]

Martin Pool has voted approve.
Status is now: Approved
Comment:
      """
      if show_unchanged is not None:
-        warn("show_status_trees with show_unchanged has been deprecated 
"
+        warn("show_tree_status with show_unchanged has been deprecated 
"
               "since bzrlib 0.9", DeprecationWarning, stacklevel=2)

You can just delete support for this since it's so old if you prefer...


For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C48193F78.2060505%40internode.on.net%3E