update headings

Author: Chris Cho

source/fundamentals/data-formats/document-data-format-extended-json.txt

@@ -119,11 +119,14 @@ corresponds to the format of the example you want to see:
 Read Extended JSON
 ------------------
 
-You can read an Extended JSON string into Java objects with the BSON library
-by calling the ``parse()`` static method from either the ``Document`` or
-``BsonDocument`` class, depending on which object type you need. This method
-parses the Extended JSON string in any of the formats and returns an instance
-of that class containing the data.
+Using the Document Classes
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+You can read an Extended JSON string into Java document objects by calling
+the ``parse()`` static method from either the ``Document`` or ``BsonDocument``
+class, depending on which object type you need. This method parses the Extended
+JSON string in any of the formats and returns an instance of that class
+containing the data.
 
 The following example shows how you can use the ``Document`` class to read
 an example Extended JSON string into a ``Document`` object using the
@@ -147,8 +150,8 @@ The output of the code above resembles the following:
 For more information on the driver document classes, see our Fundamentals page
 on :doc:`Documents </fundamentals/data-formats/documents>`.
 
-Read Extended JSON using the BSON Library
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Using the BSON Library
+~~~~~~~~~~~~~~~~~~~~~~
 
 You can also read an Extended JSON string into Java objects without using
 the MongoDB driver's document classes by using the
@@ -196,6 +199,9 @@ section, see the following API documentation:
 Write Extended JSON
 -------------------
 
+Using the Document Classes
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
 You can write an Extended JSON string from an instance of ``Document`` or
 ``BsonDocument`` by calling the ``toJson()`` method, passing it an instance of
 ``JsonWriterSettings`` to specify the Extended JSON format.
@@ -217,13 +223,12 @@ The output of this code example resembles the following:
 
    {"_id": ObjectId("507f1f77bcf86cd799439011"), "myNumber": NumberLong(4794261)}
 
-Write Extended JSON using the BSON Library
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Using the BSON Library
+~~~~~~~~~~~~~~~~~~~~~~
 
-You can also read an Extended JSON string into Java objects without using
-the MongoDB driver's document classes by using the
-:java-docs:`JsonWriter </apidocs/bson/org/bson/json/JsonWriter.html>` class.
-To construct an instance of ``JsonWriter``, pass a subclass of a Java
+You can also read an Extended JSON string into Java objects using the BSON
+library directly with the :java-docs:`JsonWriter </apidocs/bson/org/bson/json/JsonWriter.html>`
+class. To construct an instance of ``JsonWriter``, pass a subclass of a Java
 ``Writer`` to specify how you want to output the Extended JSON. You can
 optionally pass a :java-docs:`JsonWriterSettings </apidocs/bson/org/bson/json/JsonWriterSettings.html>`
 instance to specify options such as the Extended JSON format. By default, the