Added Graph drivers docs.

docs/src/reference/the-graph.asciidoc

@@ -1,4 +1,4 @@
-*////
+////
 Licensed to the Apache Software Foundation (ASF) under one or more
 contributor license agreements.  See the NOTICE file distributed with
 this work for additional information regarding copyright ownership.
@@ -13,7 +13,7 @@ distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
-_////
+////
 [[graph]]
 The Graph
 =========
@@ -898,5 +898,4 @@ IMPORTANT: TinkerPop uses `tinkerpop.` and `gremlin.` as the prefixes for provid
 reduce implementations, and plugins.
 
 The only truly protected namespace is the _hidden namespace_ provided to graph systems. From there, it's up to
-engineers to respect the namespacing conventions presented.
-*_
+engineers to respect the namespacing conventions presented.

docs/src/upgrade/release-3.2.x-incubating.asciidoc

@@ -198,6 +198,19 @@ VertexTest Signatures
 The method signatures of `get_g_VXlistXv1_v2_v3XX_name` and `get_g_VXlistX1_2_3XX_name` of `VertexTest` were changed
 to take arguments for the `Traversal` to be constructed by extending classes.
 
+Graph Drivers Providers
+^^^^^^^^^^^^^^^^^^^^^^
+
+GraphSON 2.0
+++++++++++++
+
+Drivers providers can exploit the new format of typed values JSON serialization offered by GraphSON 2.0. This format
+has been created to allow easy and agnostic parsing of a GraphSON payload without type loss. Drivers of non Java
+languages can then implement their own mapping of the GraphSON's language agnostic type IDs like `UUID`, `LocalDate` to
+the appropriate representation for the driver's language. A more detailed description of GraphSON 2.0 can be found
+there : link:http://tinkerpop.apache.org/docs/3.2.1-incubating/reference/#graphson-2.0-types[Reference Documentation
+- GraphSON 2.0]
+
 TinkerPop 3.2.0
 ---------------