docs: Emphasize required matcher change for `localePrefix: 'as-necess…

…ary'`

docs/src/pages/docs/routing.mdx

@@ -83,7 +83,7 @@ export const routing = defineRouting({
 });
 ```
 
-Additionally, you should adapt your middleware matcher to detect [unprefixed pathnames](/docs/routing/middleware#matcher-no-prefix) for this routing strategy to work as expected.
+**Important**: For this routing strategy to work as expected, you should adapt your middleware matcher to detect [unprefixed pathnames](/docs/routing/middleware#matcher-no-prefix).
 
 Note that if a superfluous locale prefix like `/en/about` is requested, the middleware will automatically redirect to the unprefixed version `/about`. This can be helpful in case you're redirecting from another locale and you want to update a potential cookie value first (e.g. [`<Link />`](/docs/routing/navigation#link) relies on this mechanism).