docs: update home layout slots of the docs (#2012)

docs/guide/customization-intro.md

@@ -212,6 +212,7 @@ Full list of slots available in the default theme layout:
   - `aside-ads-after`
 - When `layout: 'home'` is enabled via frontmatter:
   - `home-hero-before`
+  - `home-hero-info`
   - `home-hero-image`
   - `home-hero-after`
   - `home-features-before`