merge fix #2

Author: kay-kim

source/tutorial/change-streams-example.txt

@@ -62,28 +62,12 @@ Change Stream Examples
          The Node.js examples below assume that you have `connected to a MongoDB replica set and have accessed a database
          <https://mongodb.github.io/node-mongodb-native/api-generated/mongoclient.html#connect>`_
          that contains an ``inventory`` collection.
-         
-         
-.. important::
-   Change streams are available for replica sets or sharded clusters with replica set
-   shards. You cannot open a change stream against a standalone :program:`mongod`.
-   For a sharded cluster, you must issue the open change stream operation against
-   the :program:`mongos`.
-
-   The replica set or the sharded cluster must use:
-
-   - replica set protocol version 1 (:rsconf:`pv1 <protocolVersion>`)
-
-   -  :ref:`WiredTiger <storage-wiredtiger>` storage engine (can be :ref:`encrypted <encrypted-storage-engine>`)
-
-
-
-     - id: ruby
-       content: |
-         The examples below assume that you have `connected to a MongoDB replica set and have accessed a database
-         <https://docs.mongodb.com/ruby-driver/master/tutorials/ruby-driver-create-client/>`_
-         that contains an ``inventory`` collection.
-
+      
+      - id: ruby
+        content: |
+          The examples below assume that you have `connected to a MongoDB replica set and have accessed a database
+          <https://docs.mongodb.com/ruby-driver/master/tutorials/ruby-driver-create-client/>`_
+          that contains an ``inventory`` collection.
 
 
 Open A Change Stream