DOCS-11263 updated batchSize to link to the correct command (#4027)

* DOCS-11263 made a mistake and did not update one of the links for the previous ticket this PR fixes that

* format improvements

* review improvements

* final improvements

* rewording

* consolidated PRs and made an includes statement

* clarity edits

* fixed technical errors

* tighten copy

* nits

Author: gmiller-mdb

source/includes/batch-size-aggregate.rst

@@ -0,0 +1,9 @@
+The ``{ cursor: { batchSize: 0 } }`` document, which specifies the size of the 
+*initial* batch size, indicates an empty first batch. This batch size is useful 
+for quickly returning a cursor or failure message without doing significant 
+server-side work. 
+
+To specify batch size for subsequent :dbcommand:`getMore` operations 
+(after the initial batch), use the ``batchSize`` field when running the 
+:dbcommand:`getMore` command. 
+

source/reference/command/aggregate.txt

@@ -458,13 +458,7 @@ To specify an *initial* batch size, specify the ``batchSize`` in the
       { cursor: { batchSize: 0 } }
    )
 
-The ``{batchSize: 0 }`` document specifies the size of the *initial*
-batch size only. Specify subsequent batch sizes for future ``getMore`` operations 
-with the ``batchSize`` parameter. Mongosh provides the :method:`~cursor.batchSize()`
-to specify the ``batchSize``. More information about this parameter can be found
-here: :dbcommand:`getMore` . A ``batchSize`` of ``0`` means 
-an empty first batch and is useful if you want to quickly get back a cursor or 
-failure message, without doing significant server-side work.
+.. include:: /includes/batch-size-aggregate.rst
 
 Specify a Collation
 ~~~~~~~~~~~~~~~~~~~

source/reference/method/db.collection.aggregate.txt

@@ -446,10 +446,7 @@ For example, the following aggregation operation specifies the
                         }
                       )
 
-A ``batchSize`` of ``0`` means an empty
-first batch and is useful for quickly returning a cursor or failure
-message without doing significant server-side work. Specify subsequent
-batch sizes for future ``getMore`` operations with :method:`~cursor.batchSize()`.
+.. include:: /includes/batch-size-aggregate.rst
 
 .. include:: /includes/note-mongo-shell-automatically-iterates-cursor.rst