Everywhere: Clean up AD-HOC and FIXME comments without colons

Author: https://github.com/Psychpsyo
Commit: 100f37995f
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6810

Libraries/LibWeb/HTML/HTMLImageElement.cpp

@@ -1036,7 +1036,7 @@ void HTMLImageElement::upgrade_pending_request_to_current_request()
 
 void HTMLImageElement::handle_failed_fetch()
 {
-    // AD-HOC
+    // AD-HOC: This should be closer to the spec
     dispatch_event(DOM::Event::create(realm(), HTML::EventNames::error));
 }