Replace deprecated Addon::callHooks with Hook::callAll

- Update documentation

mod/subthread.php

@@ -3,7 +3,7 @@
  * @file mod/subthread.php
  */
 use Friendica\App;
-use Friendica\Core\Addon;
+use Friendica\Core\Hook;
 use Friendica\Core\L10n;
 use Friendica\Core\Logger;
 use Friendica\Core\System;
@@ -149,7 +149,7 @@ EOT;
 
 	$arr['id'] = $post_id;
 
-	Addon::callHooks('post_local_end', $arr);
+	Hook::callAll('post_local_end', $arr);
 
 	exit();