[feature/system-cron] preg_match returns int so cast to bool, fix comment

PHPBB3-9596

phpBB/includes/cron/manager.php

@@ -132,7 +132,7 @@ class phpbb_cron_manager
 	*/
 	public function is_valid_name($name)
 	{
-		return preg_match('/^[a-zA-Z][a-zA-Z0-9_]*$/', $name);
+		return (bool) preg_match('/^[a-zA-Z][a-zA-Z0-9_]*$/', $name);
 	}
 
 	/**

phpBB/includes/lock/db.php

@@ -55,7 +55,7 @@ class phpbb_lock_db
 	/**
 	* Creates a named released instance of the lock.
 	*
-	* You have to call lock to actually create the lock.
+	* You have to call acquire() to actually create the lock.
 	*
 	* @param	string	$config_name	A config variable to be used for locking
 	* @param	array	$config			The phpBB configuration