add driver options to config samples

config/config.sample.php

@@ -119,6 +119,13 @@ $CONFIG = array(
  */
 'dbtableprefix' => '',
 
+/**
+ * Additional driver options for the database connection, eg. to enable SSL encryption in MySQL:
+ */
+'dbdriveroptions' => array(
+	PDO::MYSQL_ATTR_SSL_CA => '/file/path/to/ca_cert.pem',
+),
+
 /**
  * Indicates whether the ownCloud instance was installed successfully; ``true``
  * indicates a successful installation, and ``false`` indicates an unsuccessful