add On This Page widget / standardize headings

Author: mongoKart

source/compatibility.txt

@@ -1,10 +1,17 @@
 .. _golang-compatibility:
 
+=============
 Compatibility
--------------
+=============
+
+.. contents:: On this page
+   :local:
+   :backlinks: none
+   :depth: 2
+   :class: singlecol
 
 MongoDB Compatibility
-~~~~~~~~~~~~~~~~~~~~~
+---------------------
 
 The following compatibility table specifies the recommended version(s) of the
 {+driver-long+} for use with a specific version of MongoDB.
@@ -16,7 +23,7 @@ The first column lists the driver version(s).
 .. include:: /includes/mongodb-compatibility-table-go.rst
 
 Language Compatibility
-~~~~~~~~~~~~~~~~~~~~~~
+----------------------
 
 .. include:: /includes/language-compatibility-table-go.rst