Sync cli docs (#1013)

sync cli docs

Co-authored-by: Rich-Harris <[email protected]>

Author: github-actions[bot]

apps/svelte.dev/content/docs/cli/20-commands/40-sv-migrate.md

@@ -19,6 +19,10 @@ npx sv migrate [migration]
 
 Upgrades a Svelte 4 app to use Svelte 5, and updates individual components to use [runes](../svelte/what-are-runes) and other Svelte 5 syntax ([see migration guide](../svelte/v5-migration-guide)).
 
+### `self-closing-tags`
+
+Replaces all the self-closing non-void elements in your `.svelte` files. See the [pull request](https://github.com/sveltejs/kit/pull/12128) for more details.
+
 ### `svelte-4`
 
 Upgrades a Svelte 3 app to use Svelte 4 ([see migration guide](../svelte/v4-migration-guide)).