trivial: ref link fix

Author: kay-kim

source/release-notes/4.2.txt

@@ -194,7 +194,7 @@ Deprecate ``SSL`` Options
 ~~~~~~~~~~~~~~~~~~~~~~~~~
 
 MongoDB 4.2 deprecates the ``SSL`` options for :binary:`~bin.mongod`
-and :binary:`~bin.mongos` in favor of the equivalent :ref:`TLS`
+and :binary:`~bin.mongos` in favor of the equivalent :ref:`TLS <4.2-tls>`
 options. The deprecated options can be found under :ref:`SSL Options
 for mongod <ssl-mongod-options>` for the command-line options and under
 :ref:`net-ssl-conf-options` for the configuration file options.