DOCS-948 incorporate kristina's feedback

Author: kay-kim

source/core/shell-types.txt

@@ -143,35 +143,51 @@ NumberLong
 
 By default, the :program:`mongo` shell treats all numbers as
 floating-point values. The :program:`mongo` shell provides the
-``NumberLong()`` class to handle numbers of 64-bit integers.
+``NumberLong()`` class to handle 64-bit integers.
 
 The ``NumberLong()`` constructor accepts the long as a string:
 
 .. code-block:: javascript
 
-   NumberLong("20908458868526654")
+   NumberLong("2090845886852")
 
 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.insert( { _id: 10, calc: NumberLong("2090845886852") } )
    db.collection.update( { _id: 10 },
-                         { $set:  { calc: NumberLong("209084588685266550") } } )
+                         { $set:  { calc: NumberLong("2555555000000") } } )
+   db.collection.update( { _id: 10 },
+                         { $inc: { calc: NumberLong(5) } } )
+
+Retrieve the document to verify:
+
+.. code-block:: javascript
+
+   db.collection.findOne( { _id: 10 } )
+
+In the returned document, the ``calc`` field contains a
+``NumberLong`` object:
+
+.. code-block:: sh
+
+   { "_id" : 10, "calc" : NumberLong("2555555000005") }
 
 If you :operator:`increment <$inc>` the field that contains a
-``NumberLong`` object, the data type changes to a floating point value,
-as in the following example:
+``NumberLong`` object by a **float**, the data type changes to a
+floating point value, as in the following example:
 
-#. :operator:`Increment <$inc>` the ``calc`` field:
+#. :operator:`Increment <$inc>` the ``calc`` field by ``5`` which the
+   :program:`mongo` shell treats as a float:
 
    .. code-block:: javascript
 
       db.collection.update( { _id: 10 },
                             { $inc: { calc: 5 } } )
 
-#. Select the updated document:
+#. Retrieve the updated document:
 
    .. code-block:: javascript
 
@@ -182,4 +198,4 @@ as in the following example:
 
    .. code-block:: sh
 
-      { "_id" : 10, "calc" : 209084588685266560 }
+      { "_id" : 10, "calc" : 2555555000010 }