docs(v2): trim the useIsAlive header comment

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: gantoine

frontend/src/v2/composables/useIsAlive/index.ts

@@ -1,15 +1,5 @@
 // useIsAlive — tracks whether the owning effect scope is still active, so an
 // async handler that resolves late can tell it's talking to a dead component.
-//
-// Replaces the manual pattern:
-//   let unmounted = false;
-//   onBeforeUnmount(() => { unmounted = true; });
-//
-// Cleanup uses `onScopeDispose` (not `onBeforeUnmount`) so it also works from
-// a non-component effect scope, e.g. inside another composable.
-//
-// Note: VueUse's `useMounted` is not a substitute — it only flips to `true` on
-// mount and never back to `false` on teardown.
 import { onScopeDispose, shallowRef, type ShallowRef } from "vue";
 
 export function useIsAlive(): ShallowRef<boolean> {