DOCS-948 NumberLong in shell

Author: kay-kim

source/core/shell-types.txt

@@ -136,6 +136,28 @@ the following operation in the :program:`mongo` shell:
 .. see:: :doc:`/core/object-id` for full documentation of ObjectIds in
    MongoDB.
 
+.. _shell-type-long:
+
+NumberLong
+----------
+
+The :program:`mongo` shell provides the ``NumberLong()`` class to handle
+numbers of type long.
+
+The ``NumberLong()`` accepts the long as a string:
+
+.. code-block:: javascript
+
+   NumberLong("20908458868526654")
+
+The following examples use the ``NumberLong()`` class to write to the
+collection:
+
+.. code-block:: javascript
+
+   db.collection.insert( { _id: 10, calc: NumberLong("20908458868526654") } )
+   db.collection.update( { _id: 10 },
+                         { $set:  { calc: NumberLong("209084588685266550") } } )
 
 .. wiki content -- I don't think the following applies anymore