LibWeb: Bring destroy the child navigable comments closer to spec

Userland/Libraries/LibWeb/HTML/NavigableContainer.cpp

@@ -261,25 +261,27 @@ void NavigableContainer::destroy_the_child_navigable()
     // 3. Set container's content navigable to null.
     m_content_navigable = nullptr;
 
-    // 4. Destroy navigable's active document.
+    // FIXME: 4. Inform the navigation API about child navigable destruction given navigable.
+
+    // 5. Destroy navigable's active document.
     navigable->active_document()->destroy();
 
-    // 5. Let parentDocState be container's node navigable's active session history entry's document state.
+    // 6. Let parentDocState be container's node navigable's active session history entry's document state.
     auto parent_doc_state = this->navigable()->active_session_history_entry()->document_state;
 
-    // 6. Remove the nested history from parentDocState's nested histories whose id equals navigable's id.
+    // 7. Remove the nested history from parentDocState's nested histories whose id equals navigable's id.
     parent_doc_state->nested_histories().remove_all_matching([&](auto& nested_history) {
         return navigable->id() == nested_history.id;
     });
 
-    // 7. Let traversable be container's node navigable's traversable navigable.
+    // 8. Let traversable be container's node navigable's traversable navigable.
     auto traversable = this->navigable()->traversable_navigable();
 
     // Not in the spec
     navigable->set_has_been_destroyed();
     HTML::all_navigables().remove(navigable);
 
-    // 8. Append the following session history traversal steps to traversable:
+    // 9. Append the following session history traversal steps to traversable:
     traversable->append_session_history_traversal_steps([traversable] {
         // 1. Apply pending history changes to traversable.
         traversable->update_for_navigable_creation_or_destruction();