Remove IMongoQueryable (#232)

Author: mongoKart

source/fundamentals/linq.txt

@@ -78,11 +78,6 @@ as follows:
     var restaurantsCollection = restaurantsDatabase.GetCollection<Restaurant>("restaurants");
     var queryableCollection = restaurantsCollection.AsQueryable();
 
-The ``AsQueryable()`` method returns an `IMongoQueryable
-<{+new-api-root+}/MongoDB.Driver/MongoDB.Driver.Linq.IMongoQueryable.html>`__ instance that
-has the ``IQueryable`` extension methods, along with a set of
-MongoDB specific methods.
-
 Once you have the queryable object, you can compose a query using 
 **method syntax**. Some pipeline stages also support **query comprehension syntax**,
 which resembles SQL query syntax.

source/upgrade.txt

@@ -66,6 +66,10 @@ Version 3.0 Potential Breaking Change
   configuring authentication in the {+driver-short+}, see
   :ref:`Authentication Mechanisms. <csharp-authentication-mechanisms>`
 
+- This version of the driver replaces the ``IMongoQueryable`` interface with the
+  ``IQueryable`` interface, following the pattern used by most other LINQ providers. If your
+  application contains references to ``IMongoQueryable``, replace them with ``IQueryable``.
+
 - This version removes the ``ClusterBuilder.ConfigureSdamLogging()`` method.
   To configure logging in your application, see the :ref:`csharp-logging` guide.