* Return true if we're to watch the page, false if not, null if no change.
* @param $watchlist String Valid values: 'watch', 'unwatch', 'preferences', 'nochange'
* @param $titleObj Title the page under consideration
- * @param $userOption The user option to consider when $watchlist=preferences.
+ * @param $userOption String The user option to consider when $watchlist=preferences.
* If not set will magically default to either watchdefault or watchcreations
* @returns mixed
*/