Update Hadoop Connector Tutorial

The Hadoop Connector Tutorial https://docs.mongodb.com/ecosystem/tutorial/getting-started-with-hadoop/#mongodb mentions that the Hadoop Connector uses the splitVector action and therefore needs the privileges for this.
However this does not seem to be necessary any more: https://jira.mongodb.org/browse/HADOOP-283
This change also should make it possible to use Hadoop together with Atlas. Therefore adding an Hadoop example to the Atlas docs would be nice as well.