Fixed a STX bug. Actually STX should probably be fixed to recognize examples...

Fixed a STX bug. Actually STX should probably be fixed to recognize examples even if there is space following the double colon introduction line.

lib/python/Products/OFSP/help/dtml-tree.stx

@@ -105,7 +105,7 @@ tree: Inserts a tree widget
       </dtml-tree>
 
     Display a tree rooted in another object, using a custom branches
-    method:: 
+    method::
 
       <dtml-tree expr="folder.object" branches="objectValues">
         Node id : <dtml-var getId>