DOCS-12545 updating replicaSet option (#3636) (#3859)

* DOCS-12545 updating replicaSet option to say that it is required when using drivers

* changed wording

* fixed wording

Author: gmiller-mdb

source/reference/connection-string.txt

@@ -424,7 +424,9 @@ members running on the specified hosts:
    * - .. urioption:: replicaSet
 
      - Specifies the name of the :term:`replica set`, if the
-       :binary:`~bin.mongod` is a member of a replica set.
+       :binary:`~bin.mongod` is a member of a replica set. Set the ``replicaSet``
+       connection option to ensure consistent behavior across drivers. 
+       
 
        When connecting to a replica set, provide a :term:`seed list` of 
        the replica set member(s) to the ``host[:port]`` component of the