docs: update sitemap's version history section (#66478)

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### What?
This is an update on the documentation at the sitemap version history to
add the update (https://github.com/vercel/next.js/pull/53765) in
[v14.2.0](https://github.com/vercel/next.js/releases/tag/v14.2.0).
### Why?
I really appreciate that the next sitemap generator supports
localization. It would be great if we could see which version or higher
provides this support.

### How?
I added a new row at the top of the version history table.

---------

Co-authored-by: Sam Ko <sam@vercel.com>

docs/02-app/02-api-reference/02-file-conventions/01-metadata/sitemap.mdx

@@ -295,5 +295,6 @@ type Sitemap = Array<{
 
 | Version   | Changes                                                      |
 | --------- | ------------------------------------------------------------ |
+| `v14.2.0` | Add localizations support.                                   |
 | `v13.4.5` | Add `changeFrequency` and `priority` attributes to sitemaps. |
 | `v13.3.0` | `sitemap` introduced.                                        |