docs: mention Algolia appId option in config snippet (#2957)

* docs: mention Algolia `appId` option in config snippet

* Update default-theme-config.md

Co-authored-by: meteorlxy <[email protected]>

Author: shortcuts

packages/docs/docs/theme/default-theme-config.md

@@ -394,6 +394,8 @@ module.exports = {
     algolia: {
       apiKey: '<API_KEY>',
       indexName: '<INDEX_NAME>'
+      // If Algolia did not provided you any `appId`, use `BH4D9OD16A` or remove this option
+      appId: '<APP_ID>',
     }
   }
 }

packages/docs/docs/zh/theme/default-theme-config.md

@@ -386,6 +386,8 @@ module.exports = {
     algolia: {
       apiKey: '<API_KEY>',
       indexName: '<INDEX_NAME>'
+      // 如果 Algolia 没有为你提供 `appId` ，使用 `BH4D9OD16A` 或者移除该配置项
+      appId: '<APP_ID>',
     }
   }
 }