docs: tweaks/fixes to papercuts (#87445)

docs/01-app/01-getting-started/16-proxy.mdx

@@ -52,7 +52,6 @@ export function proxy(request: NextRequest) {
 // Alternatively, you can use a default export:
 // export default function proxy(request: NextRequest) { ... }
 
-// See "Matching Paths" below to learn more
 export const config = {
   matcher: '/about/:path*',
 }
@@ -69,10 +68,11 @@ export function proxy(request) {
 // Alternatively, you can use a default export:
 // export default function proxy(request) { ... }
 
-// See "Matching Paths" below to learn more
 export const config = {
   matcher: '/about/:path*',
 }
 ```
 
+The `matcher` config allows you to filter Proxy to run on specific paths. See the [Matcher](/docs/app/api-reference/file-conventions/proxy#matcher) documentation for more details on path matching.
+
 Read more about [using `proxy`](/docs/app/guides/backend-for-frontend#proxy), or refer to the `proxy` [API reference](/docs/app/api-reference/file-conventions/proxy).

docs/01-app/03-api-reference/03-file-conventions/dynamic-routes.mdx

@@ -195,7 +195,7 @@ Provide params ahead of time to prerender pages at build time. You can prerender
 
 During the build process, the route is executed with each sample param to collect the HTML result. If dynamic content or runtime data are accessed incorrectly, the build will fail.
 
-```tsx filename="app/blog/[slug]/page.tsx" highlight={5-7,10,22,24}
+```tsx filename="app/blog/[slug]/page.tsx" highlight={3-5,8,19}
 import { Suspense } from 'react'
 
 export async function generateStaticParams() {

docs/01-app/03-api-reference/04-functions/generate-metadata.mdx

@@ -1217,12 +1217,11 @@ Streaming metadata at runtime while the rest of the page is fully prerenderable
 
 To resolve this, you have two options. If metadata depends on external data but not runtime data, use `use cache`:
 
-```tsx filename="app/blog/[slug]/page.tsx" highlight={2}
-export async function generateMetadata({ params }) {
+```tsx filename="app/page.tsx" highlight={2}
+export async function generateMetadata() {
   'use cache'
-  const { slug } = await params
-  const post = await db.getPost(slug)
-  return { title: post.title }
+  const { title, description } = await db.query('site-metadata')
+  return { title, description }
 }
 ```