Clean up comments in renderer.ts

Remove outdated comments regarding result association with root state.

Author: NullVoxPopuli

packages/@ember/-internals/glimmer/lib/renderer.ts

@@ -232,15 +232,6 @@ class ClassicRootState {
 
       let result = (this.result = iterator.sync());
 
-      // Associate the result with the root state (not the owner) so that
-      // destruction cascades through:
-      //   Owner → Container → Renderer → RendererState → ClassicRootState → result
-      // This ensures the container is still alive when component destructors
-      // run (e.g. willDestroy looking up the renderer via injection).
-      // Previously, associating with the owner made the result a sibling of
-      // the Container, causing the Container to be destroyed first — which
-      // broke FastBoot where the container was already dead by the time
-      // component teardown tried to do lookups. (See: emberjs/ember.js#20984)
       associateDestroyableChild(this, result);
 
       this.render = errorLoopTransaction(() => {