DOCS 15629 (#163)

* DOCS-15629 making mongosync limitations more prominent

* DOCS-15629 making mongosync limitations more prominent

* DOCS-15629 copy edits

* DOCS-15629 adding atlas to snooty.toml

* DOCS-15629 adding atlas to snooty.toml

* DOCS-15629 adding atlas to snooty.toml

* DOCS-15629 copy edits

* DOCS-15629 tech review edits

* DOCS-15629 tech review edits

* DOCS-15629 tech review edits

* DOCS-15629 fixing bullet

* DOCS-15629 fixing bullet

Author: ltran-mdb2

source/reference/mongosync.txt

@@ -32,6 +32,10 @@ line options.
    - Standalone MongoDB instances are not supported. :ref:`Convert the
      standalone instance <server-replica-set-deploy-convert>` to a
      replica set before using {+c2c-product-name+}. 
+   - ``mongosync`` does not support Atlas shared clusters or serverless 
+     instances. 
+   - For a full list of limitations, see :ref:`Cluster-to-Cluster Sync
+     Limitations<c2c-limitations>`. 
 
 .. _c2c-cli-options: