Updated docstring of mergeRevision

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@29822 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/interfaces/versionable.py

@@ -88,5 +88,6 @@ class IVersionable(Interface):
     Merge the current document with any previous revision
     by using the content of the current document to replace
     the content of previous revisions, and by deleting the
-    current document afterwards.
+    current document afterwards. Returns the resulting
+    document of the merge process.
     """