docs(kida): fix 'for' example

Author: dangreen

packages/kida/README.md

@@ -53,16 +53,14 @@ export const $admins = computed(get => get($users).filter(user => user.isAdmin))
 
 ```tsx
 // components/admins.ts
-import { atIndex, record } from 'kida'
+import { record } from 'kida'
 import { $admins } from '../stores/admins.js'
 
 export function Admins() {
   return ul()(
-    for$($admins)((i) => {
-      const $admin = record(atIndex($admins, i))
-
-      return li()($admin.name)
-    })
+    for$($admins, user => user.id)(
+      $admin => li()(record($admin).name)
+    )
   )
 }
 ```