Robert,
If you were already using
{$jetty.base}/start.ini to define your modules then I would keep doing that. Using the
{$jetty.base}/start.d directory has become our preferred method and the guides have started being updated to reflect this preference. I will update the section you referenced to better reflect this. More information on start.ini vs start.d can be found in our documentation on
Managing Startup Modules.
As to your question about what to do next. First, I'd undo the renaming of the file and leave it as start.ini as it looks like that is what you had been using beforehand. After that you'll just need to adjust the configuration in the ssl section of that ini file to meet your needs. This is as easy as uncommenting the lines of the various configurations you will use and setting their values to reflect your environment, such as setting the jetty.sslContext.keyStorePath= to the location of your keystore or jetty.ssl.port= to define the port to listen for SSL connections on.
Best,
Chris