DOCSP-48764 Add Docker replica set connection note (#174)

Author: stephmarie17

source/fundamentals/connections/connection-guide.txt

@@ -234,3 +234,7 @@ following behavior:
   specified host isn't the primary member. To learn more about these
   replica set members, see :manual:`Replica Set Secondary Members
   </core/replica-set-secondary/>` in the Server manual.
+
+.. note:: Replica Set in Docker
+
+   .. sharedinclude:: dbx/docker-replica-set.rst