Document how to determine if your binary is enterprise

source/includes/fact-confirm-enterprise-binaries.rst

@@ -0,0 +1,9 @@
+To verify MongoDB Enterprise binaries:
+
+.. code-block:: sh
+
+   mongod --version
+
+In the output from this command, look for the string ``modules:
+subscription`` or ``modules: enterprise`` to confirm your system has
+MongoDB Enterprise.

source/tutorial/control-access-to-mongodb-with-kerberos-authentication.txt

@@ -23,6 +23,8 @@ this document. This tutorial assumes you have have configured a
 deployment, and you have a valid :ref:`keytab file <keytab-files>` for
 for each :program:`mongod` and :program:`mongos` instance.
 
+.. include:: /includes/fact-confirm-enterprise-binaries.rst
+
 Procedure
 ---------
 

source/tutorial/troubleshoot-kerberos.txt

@@ -14,8 +14,11 @@ Kerberos Configuration Checklist
 If you have difficulty starting :program:`mongod` or :program:`mongos`
 with :doc:`Kerberos </core/kerberos>` on Linux systems, ensure that:
 
-- The :program:`mongod` and the :program:`mongos` binaries are
-  from MongoDB Enterprise.
+
+- The :program:`mongod` and the :program:`mongos` binaries are from
+  MongoDB Enterprise. 
+
+  .. include:: /includes/fact-confirm-enterprise-binaries.rst
 
 - You are not using the :ecosystem:`HTTP Console
   </tools/http-interface/#http-console>`. MongoDB Enterprise