DOCSP-46349 note that conversion from RS to Sharded isn't supported (#652)

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- [DOCSP-46349](https://jira.mongodb.org/browse/DOCSP-46349)
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[STAGING](https://deploy-preview-652--10gen-docs-ops-manager.netlify.app/tutorial/convert-replica-set-to-sharded-cluster/)

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Author: kanchana-mongodb

source/tutorial/convert-replica-set-to-sharded-cluster.txt

@@ -13,7 +13,13 @@ Convert a Replica Set to a Sharded Cluster
    :class: singlecol
 
 |mms| provides the ability to convert a :manual:`replica set </reference/glossary/#std-term-replica-set>` to
-a :manual:`sharded cluster </reference/glossary/#std-term-sharded-cluster>`.
+a :manual:`sharded cluster
+</reference/glossary/#std-term-sharded-cluster>`.
+
+.. note:: 
+
+   You can't convert a replica set to a sharded cluster in a Kubernetes
+   environment. 
 
 .. include:: /includes/steps/convert-replica-set-to-sharded-cluster.rst