DOCS-15396 Warn about incompatible drivers that use unsupported opcodes (#3716)

* DOCS-15396 Warn about incompatible drivers that use unsupported opcodes

* Apply suggestions from code review

Co-authored-by: Ashley Brown <[email protected]>

* DOCS-15396 move content to includes file

---------

Co-authored-by: Ashley Brown <[email protected]>

Author: kanchana-mongodb

source/includes/fact-warning-unsupported-opcodes.rst

@@ -0,0 +1,4 @@
+If your drivers use :ref:`legacy opcodes <wire-legacy-opcodes>` that
+were deprecated in v3.6, update your drivers to
+a version that uses supported opcodes. Drivers that use legacy 
+opcodes are no longer supported.

source/includes/upgrade-guidance-checklists.rst

@@ -31,6 +31,10 @@ compatibility with MongoDB |newversion|.
 Upgraded deployments that run on incompatible drivers might encounter 
 unexpected or undefined behavior.
 
+.. warning:: 
+
+   .. include:: /includes/fact-warning-unsupported-opcodes.rst
+
 Preparedness
 ~~~~~~~~~~~~
 

source/release-notes/6.0-compatibility.txt

@@ -301,6 +301,8 @@ database commands:
    To avoid disruption due to the removal of these opcodes, **upgrade your
    driver to the latest version**.
 
+   .. include:: /includes/fact-warning-unsupported-opcodes.rst
+
 If you attempt to connect to a MongoDB 3.4 or older :binary:`mongod`
 instance with a MongoDB 5.1 or newer ``mongo`` shell, you
 will receive an error message like the following: