Oops! Quite right, I’m not sure how I missed that.
The name of the files in the documentation example code are a bit obtuse, so I’m not quite sure. The names seem to imply the SSLAuthority is a property for MySQL to use and SSLAuthorityDirectory is a property for the SSL connection to use, so perhaps?
UPDATE: I found someone else has tried explaining these properties previously, try the information available in this thread: Setting up SSL in MySQL - #2 by Justin_Elliott