(DOCSP-26525): Change streams grammar fix (#2354)

Author: jeff-allen-mongo

source/changeStreams.txt

@@ -1107,9 +1107,9 @@ For deployments enforcing :ref:`authentication` and :ref:`authorization
 
      { resource: { db: <dbname>, collection: <collection> }, actions: [ "find", "changeStream" ] }
 
-- To open a change stream on a single databases, applications must have
+- To open a change stream on a single database, applications must have
   privileges that grant :authaction:`changeStream` and
-  :authaction:`find` actions on all non-``system`` collections in a
+  :authaction:`find` actions on all non-``system`` collections in the
   database.
 
   .. code-block:: javascript