Sort should be before not after group

Author: asya999

source/includes/note-group-and-window-behavior.rst

@@ -1,6 +1,6 @@
 To define the document order for |method| with the:
 
-- :pipeline:`$group` stage, add a :pipeline:`$sort` stage after the
+- :pipeline:`$group` stage, add a :pipeline:`$sort` stage before the
   :pipeline:`$group` stage.
 
 - :pipeline:`$setWindowFields` stage, set the :ref:`sortBy
@@ -17,4 +17,4 @@ When used with :pipeline:`$setWindowFields`, |method| returns ``null``
 for empty :ref:`windows <setWindowFields-window>`. An example empty
 window is a ``{ documents: [ -1, -1 ] }`` :ref:`documents
 <setWindowFields-documents>` window on the first document of a
-:ref:`partition <setWindowFields-partitionBy>`.
+:ref:`partition <setWindowFields-partitionBy>`.