SpringBoot Align Tomcat multiple connectors example with recommendation to configure SSL declaratively

The "Configure SSL" section says that "we recommend using application.properties to configure HTTPS, as the HTTP connector is the easier of the two to configure programmatically". The example in the docs for configuring Tomcat with multiple connectors then shows adding an SSL connector. We should simplify the example by showing how to add an HTTP connector under the assumption that the SSL connector will have been configured using configuration properties.