[Hub Next] Misskey Hubのリンクを変更 (#12699)

* misskey hub のリンクを変更

* misskey-hub.net -> assets.misskey-hub.net
Related to misskey-dev/misskey-hub-next#57

packages/frontend/src/pages/share.vue

@@ -30,7 +30,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-// SPECIFICATION: https://misskey-hub.net/docs/features/share-form.html
+// SPECIFICATION: https://misskey-hub.net/docs/for-users/features/share-form/
 
 import { ref, computed } from 'vue';
 import * as Misskey from 'misskey-js';