(DOCSP-47223) Fix updated external link. (#454)

Author: elyse-mdb

source/connect/mysql.txt

@@ -212,7 +212,7 @@ For additional options, see the
 :ref:`MySQL Commands <mysql-command-options>`.
 
 See the
-`MySQL documentation <https://dev.mysql.com/doc/refman/5.7/en/cleartext-authentication-plugin.html>`_
+`MySQL documentation <https://dev.mysql.com/doc/mysql-security-excerpt/en/cleartext-pluggable-authentication.html>`_
 for additional details on enabling the MySQL cleartext plugin.
 
 .. toctree::