Minor docs edit: cors -> CORS (#28472)

## Documentation / Examples

- [x] Make sure the linting passes

docs/api-routes/introduction.md

@@ -55,7 +55,7 @@ For new projects, you can build your entire API with API Routes. If you have an
 
 ## Caveats
 
-- API Routes [do not specify CORS headers](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS), meaning they are **same-origin only** by default. You can customize such behavior by wrapping the request handler with the [cors middleware](/docs/api-routes/api-middlewares.md#connectexpress-middleware-support).
+- API Routes [do not specify CORS headers](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS), meaning they are **same-origin only** by default. You can customize such behavior by wrapping the request handler with the [CORS middleware](/docs/api-routes/api-middlewares.md#connectexpress-middleware-support).
 - API Routes can't be used with [`next export`](/docs/advanced-features/static-html-export.md)
 
 ## Related