Update next export docs to mention i18n caveat (vercel#19491)

Fixes vercel#19486

docs/advanced-features/i18n-routing.md

@@ -224,7 +224,7 @@ Next.js doesn't know about variants of a page so it's up to you to add the `href
 
 ### Automatically Statically Optimized Pages
 
-For pages that are automatically statically optimized, a version of the page will be generated for each locale.
+For pages that are [automatically statically optimized](/docs/advanced-features/automatic-static-optimization.md), a version of the page will be generated for each locale.
 
 ### Non-dynamic getStaticProps Pages
 
@@ -270,4 +270,6 @@ export const getStaticPaths = ({ locales }) => {
 }
 ```
 
-Note: i18n routing does not currently support [`next export`](https://nextjs.org/docs/advanced-features/i18n-routing) mode as you are no longer leveraging Next.js' server-side routing.
+## Caveats
+
+Internationalized Routing does not currently support [Static HTML Export (`next export`)](/docs/advanced-features/static-html-export.md) as you are no longer leveraging Next.js' server-side routing in that case.

docs/advanced-features/static-html-export.md

@@ -71,4 +71,5 @@ By default, `next export` will generate an `out` directory, which can be served
 - The [`fallback: true`](/docs/basic-features/data-fetching.md#fallback-true) mode of `getStaticPaths` is not supported when using `next export`.
 - [API Routes](/docs/api-routes/introduction.md) are not supported by this method because they can't be prerendered to HTML.
 - [`getServerSideProps`](/docs/basic-features/data-fetching.md#getserversideprops-server-side-rendering) cannot be used within pages because the method requires a server. Consider using [`getStaticProps`](/docs/basic-features/data-fetching.md#getstaticprops-static-generation) instead.
+- [Internationalized Routing](/docs/advanced-features/i18n-routing.md) is not supported as it requires Next.js' server-side routing.
 - The [`next/image`](/docs/api-reference/next/image) component's default loader is not supported when using `next export`. However, other [loader](https://nextjs.org/docs/basic-features/image-optimization#loader) options will work.