docs: small tweaks (#59638)

Just some random cleanup I wanted to do.

docs/02-app/02-api-reference/02-file-conventions/not-found.mdx

@@ -83,6 +83,8 @@ export default async function NotFound() {
 }
 ```
 
+If you need to use Client Component hooks like `usePathname` to display content based on the path, you must fetch data on the client-side instead.
+
 ## Version History
 
 | Version   | Changes                                             |

docs/02-app/02-api-reference/04-functions/use-params.mdx

@@ -11,7 +11,7 @@ description: API Reference for the useParams hook.
 import { useParams } from 'next/navigation'
 
 export default function ExampleClientComponent() {
-  const params = useParams()
+  const params = useParams<{ tag: string; item: string }>()
 
   // Route -> /shop/[tag]/[item]
   // URL -> /shop/shoes/nike-air-max-97

docs/03-pages/01-building-your-application/07-testing/01-vitest.mdx

@@ -1,6 +1,6 @@
 ---
 title: Setting up Vitest with Next.js
-nav_title: Jest
+nav_title: Vitest
 description: Learn how to set up Next.js with Vitest and React Testing Library - two popular unit testing libraries.
 source: app/building-your-application/testing/vitest
 ---

errors/invalid-redirect-gssp.mdx

@@ -10,23 +10,59 @@ The `redirect` value returned from your `getStaticProps` or `getServerSideProps`
 
 Make sure you return the proper values for the `redirect` value.
 
-```js filename="pages/blog/[slug].js"
-export const getStaticProps = ({ params }) => {
-  if (params.slug === 'deleted-post') {
+```tsx filename="pages/index.tsx" switcher
+import type { InferGetStaticPropsType, GetStaticProps } from 'next'
+
+type Repo = {
+  name: string
+  stargazers_count: number
+}
+
+export const getStaticProps = (async (context) => {
+  const res = await fetch('https://api.github.com/repos/vercel/next.js')
+  const repo = await res.json()
+
+  if (!repo) {
     return {
       redirect: {
-        permanent: true, // or false
-        destination: '/some-location',
+        permanent: false, // or true
+        destination: '/404',
       },
     }
   }
 
+  return { props: { repo } }
+}) satisfies GetStaticProps<{
+  repo: Repo
+}>
+
+export default function Page({
+  repo,
+}: InferGetStaticPropsType<typeof getStaticProps>) {
+  return repo.stargazers_count
+}
+```
+
+```jsx filename="pages/index.js" switcher
+export async function getStaticPaths() {
+  const res = await fetch('https://api.github.com/repos/vercel/next.js')
+  const repo = await res.json()
+
+  if (!repo) {
     return {
-    props: {},
+      redirect: {
+        permanent: false, // or true
+        destination: '/404',
+      },
     }
   }
 
-export default function Page(props) {}
+  return { props: { repo } }
+}
+
+export default function Page({ repo }) {
+  return repo.stargazers_count
+}
 ```
 
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