remove obsolete comment

packages/svelte/src/internal/client/runtime.js

@@ -187,10 +187,6 @@ export function check_dirtiness(reaction) {
 				}
 
 				if (is_unowned) {
-					// If we're working with an unowned derived signal, then we need to check
-					// if our dependency write version is higher. If it is then we can assume
-					// that state has changed to a newer version and thus this unowned signal
-					// is also dirty.
 					if (is_dirty) {
 						return true;
 					}