add for distinct

Author: lindseymoore

source/read/distinct.txt

@@ -113,7 +113,12 @@ The following table describes some methods you can use to customize the
      - Description
 
    * - ``batchSize()``
-     - | Sets the number of documents to return per batch.
+     - | Sets the number of documents to return per batch. By default, returns an initial batch size 
+         of ``101`` documents and a maximum size of 16 mebibytes (MiB) for each subsequent batch. 
+         This option can enforce a smaller limit than 16 MiB, but not a larger one.
+      
+       | A ``batchSize`` of ``0`` means that the cursor will be established, but no documents 
+         will be returned in the first batch.
 
    * - ``collation()``
      - | Specifies the kind of language collation to use when sorting