Update OnClientAuthorized function doc

plugins/include/clients.inc

@@ -154,14 +154,14 @@ forward Action:OnClientCommand(client, args);
 forward void OnClientSettingsChanged(client);
 
 /**
- * Called when a client receives a Steam ID.  The state of a client's 
+ * Called when a client receives an auth ID.  The state of a client's 
  * authorization as an admin is not guaranteed here.  Use 
  * OnClientPostAdminCheck() if you need a client's admin status.
  *
  * This is called by bots, but the ID will be "BOT".
  *
  * @param client		Client index.
- * @param auth			Client auth string.
+ * @param auth			Client Steam2 id, if available, else engine auth id.
  * @noreturn
  */
 forward void OnClientAuthorized(client, const String:auth[]);