DOCSP-5004 Add reminder to check driver compatibility before upgrading server

Author: ajhuh-mdb

source/includes/upgrade-copy.rst

@@ -24,6 +24,17 @@ successively upgrade major releases until you have upgraded to
 |oldseries|. For example, if you are running a |olderseries|, you must
 |upgradefirst| *before* you can upgrade to |newversion|.
 
+Check Driver Compatibility
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Before you upgrade MongoDB, check that you're using a MongoDB 
+|newversion|-compatible driver. Consult the `driver documentation
+<https://docs.mongodb.com/drivers/>`_ for your specific driver to verify 
+compatibility with MongoDB |newversion|. 
+
+Upgraded deployments that run on incompatible drivers might encounter 
+unexpected or undefined behavior.
+
 Preparedness
 ~~~~~~~~~~~~