docs: add nitro plugins examples (#1403)

docs/content/1.guide/7.plugins.md

@@ -45,3 +45,40 @@ export default defineNuxtConfig({
 })
 ```
 ::
+
+## Examples
+
+### Graceful Shutdown
+
+You can use plugins to register a hook that resolves when Nitro is closed.
+
+```ts
+export default defineNitroPlugin((nitro) => {
+  nitro.hooks.hookOnce("close", async () => {
+    // Will run when nitro is closed
+    console.log("Closing nitro server...")
+    await new Promise((resolve) => setTimeout(resolve, 500));
+    console.log("Task is done!");
+  });
+})
+```
+
+### Renderer Response
+
+You can use plugins to register a hook that modifies the renderer response.
+
+::alert
+This **only works** for render handler defined with [`renderer`](https://nitro.unjs.io/config#renderer) and won't be called for other api/server routes.
+In [Nuxt](https://nuxt.com/) this hook will be called for Server Side Rendered pages
+::
+
+```ts
+export default defineNitroPlugin((nitro) => {
+
+  nitro.hooks.hook('render:response', (response) => {
+    // Inspect or Modify the renderer response here
+    console.log(response)
+  })
+})
+```
+