* it will be generated with the callback function (if present), and the newly
* calculated value will be stored to the cache in a wrapper.
*
- * @param BagOStuff $cache A cache object such as $wgMemc
+ * @param BagOStuff $cache A cache object
* @param string $key The cache key
* @param int $expiry The expiry timestamp or interval in seconds
* @param bool|callable $callback The callback for generating the value, or false