Add JDBC URL parameter for MySQL

docs/src/main/sphinx/connector/mysql.rst

@@ -31,6 +31,25 @@ connection properties as appropriate for your setup:
     connection-user=root
     connection-password=secret
 
+The ``connection-url`` defines the connection information and parameters to pass
+to the MySQL JDBC driver. The supported parameters for the URL are
+available in the `MySQL Developer Guide
+<https://dev.mysql.com/doc/connector-j/8.0/en/>`_.
+
+For example, the following ``connection-url`` allows you to
+configure the JDBC driver to interpret time values based on UTC as a timezone on
+the server, and serves as a `workaround for a known issue
+<https://dev.mysql.com/doc/connector-j/8.0/en/connector-j-usagenotes-known-issues-limitations.html>`_.
+
+.. code-block:: text
+
+    connection-url=jdbc:mysql://example.net:3306?serverTimezone=UTC
+
+The ``connection-user`` and ``connection-password`` are typically required and
+determine the user credentials for the connection, often a service user. You can
+use :doc:`secrets </security/secrets>` to avoid actual values in the catalog
+properties files.
+
 Multiple MySQL servers
 ^^^^^^^^^^^^^^^^^^^^^^