Remove note about specific hierarchical shortcomings

crates/bevy_ui/src/layout/mod.rs

@@ -274,9 +274,6 @@ pub fn ui_layout_system(
         .iter()
         .for_each(|(entity, maybe_parent)| {
             if let Some(parent) = maybe_parent {
-                // Note: This does not cover the case where a parent's Node component was removed.
-                // Users are responsible for fixing hierarchies if they do that (it is not recommended).
-                // Detecting it here would be a permanent perf burden on the hot path.
                 if parent.is_changed() && !ui_children.is_ui_node(parent.get()) {
                     warn!(
                         "Node ({entity}) is in a non-UI entity hierarchy. You are using an entity \