DOCS-15841 quickstart topology update (#111)

* DOCS-15841 quickstart topology update

* DOCS-15841 quickstart topology update

* Review feedback

Author: Dave Cuthbert

source/quickstart.txt

@@ -45,16 +45,10 @@ Follow the instructions below to setup {+c2c-product-name+}.
       use that cluster as the source cluster. If you don't have a
       cluster to work with, you will need to create one.
 
-      You will need a destination cluster that has the same topology
-      as your source cluster:
-      
-      - If the source cluster is a :ref:`replica  set <replication>`,
-        the destination cluster must also be a replica set. The number
-        of nodes in the destination replica set does not have to equal
-        the number of nodes in the source replica set.
-      - If the source cluster is :ref:`sharded  <sharding-background>`,
-        the destination cluster must have the same number of shards and
-        the same shard key. 
+      This Quickstart works when the destination cluster and the source
+      cluster are both replica sets. To sync from a replica set to a
+      sharded cluster, or between sharded clusters, see:
+      :ref:`c2c-sharded-clusters`.
 
       The source and destination clusters must be:
 
@@ -63,6 +57,9 @@ Follow the instructions below to setup {+c2c-product-name+}.
       - at least Feature Compatibility Version 6.0
       - the same Feature Compatibility Version
 
+      The number of nodes in the destination replica set does not have
+      to equal the number of nodes in the source replica set.
+
       If your clusters are self-managed, they must be MongoDB
       Enterprise clusters. {+c2c-product-name+} is only supported on
       MongoDB Community Edition in a limited number of cases. For more