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docs: add note for usage (#1921)

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docs/content/3.docs/1.usage/1.data-fetching.md
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Nuxt provides `useFetch`, `useLazyFetch`, `useAsyncData` and `useLazyAsyncData` to handle data fetching within your application.
::alert{icon=👉}
**`useFetch`, `useLazyFetch`, `useAsyncData` and `useLazyAsyncData` only works during `setup` or `Lifecycle Hooks`**
::
## `useAsyncData`
Within your pages, components and plugins you can use `useAsyncData` to get access to data that resolves asynchronously.
@ -57,10 +61,6 @@ Within your pages, components and plugins you can use `useFetch` to get universa
This composable provides a convenient wrapper around `useAsyncData` and `$fetch` and automatically generates a key based on url and fetch options and infers API response type.
::alert{icon=👉}
**`useFetch` only works during `setup` or `Lifecycle Hooks`**
::
### Usage
```ts

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docs/content/3.docs/1.usage/4.nuxt-app.md
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Plugins also receive `nuxtApp` as the first argument for convenience. [Read more about plugins.](/docs/directory-structure/plugins)
::alert{icon=👉}
**`useNuxtApp` (on server side) only works during `setup`, inside Nuxt plugins or `Lifecycle Hooks`**
::
## Providing helpers
You can provide helpers to be usable across all composables and application. This usually happens within a nuxt plugin.

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docs/content/3.docs/1.usage/5.runtime-config.md
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**🛑 Security note:** Never use example above if `API_AUTH_TOKEN` is a private config. Even if you use `privateRuntimeConfig`, you have to be still careful you do not expose such config to either payload or html!
::alert{icon=👉}
**`useRuntimeConfig` only works during `setup` or `Lifecycle Hooks`**
::
### API routes
Within the API routes, you can access runtime config by directly importing from virtual `#config`.