Revert "(DOCSP-37743): Add note about upgrading to sharded cluster and adding…" (#41)

This reverts commit 36dd8cd.

Author: davidhou17

source/atlasdeployment-custom-resource.txt

@@ -656,14 +656,6 @@ examples, and the |api| documentation.
         - :manual:`Sharding </sharding>`
         - :ref:`server-number-costs`
 
-   .. note:: 
-
-      To ensure consistent data distribution, you can't increase the number 
-      of shards in the same update request when upgrading your {+cluster+} 
-      from a replica set to a sharded {+cluster+}. You can add additional shards 
-      when your {+cluster+} has upgraded and you've ensured all clients have 
-      reconnected to the MongoDB router.
-
 .. setting:: spec.deploymentSpec.replicationSpecs.regionConfigs
 
    *Type*: array