Missing return $this in Url::setUnrouted

In the file : core/lib/Drupal/Core/Url.php , function setUnrouted in class Url is not returning $this. But in comment doc already documented @returng as $this.

I have added the return $this; to the function .

here is the changes,

@@ -515,6 +515,7 @@ protected function setUnrouted() {
     // Set empty route name and parameters.
     $this->routeName = NULL;
     $this->routeParameters = array();
+    return $this;