Add other distributions compatibility (#1083)

Author: davidhou17

source/tutorial/plan-k8s-op-compatibility.txt

@@ -14,6 +14,8 @@
 
 .. include:: /includes/styles/corrections.rst
 
+.. _k8s-openshift-versions:
+
 |k8s| and OpenShift Versions
 ----------------------------
 
@@ -23,6 +25,19 @@ spans the full release series starting from the listed version.
 
 .. include:: /includes/list-tables/compatibility-k8s-os.rst
 
+.. _k8s-cncf-compatibility:
+
+Other Distributions of |k8s|
+----------------------------
+
+The |k8s-op-short| is also compatible with all
+`CNCF-certified distributions <https://www.cncf.io/certification/software-conformance/>`__
+of |k8s| and core |k8s| features. The distribution version 
+must match one of the base |k8s| versions supported by the |k8s-op-short|.
+
+To learn which |k8s| versions are supported by your |k8s-op-short| series,
+see the preceding :ref:`version table <k8s-openshift-versions>`.
+
 .. _k8s-mdb-version-compatibility:
 
 Supported Platforms and MongoDB Versions