After adding the FAQ, change the link in DbOverSSLCheck.php.

Steps to using an SSL connection to MySQL include:

1. obtain SSL keys and certificate files generated using the same version of openssl as MySQL
2. in config.ini.php's [database] section, set the ssl_cert, ssl_key, ssl_ca to absolute paths to the required files (and make sure PHP can read those files or you'll get strange MySQL errors)
3. Optionally set ssl_cipher to your desired cipher
4. If you're using a self signed certificate (& your PHP version has a PDO/MySQLi that supports skipping the verification check), set the ssl_no_verify option to 1.
5. Verify in the Piwik system check that you are using an SSL connection to the database.

Not sure if this is accurate for cloud providers, and this doesn't work if the MySQL instance requires SSL, since in that case you won't be able to actually install Piwik (at least not through the web UI). We should add links to the cloud provider docs for obtaining required files as well.

Refs #10866