Merge pull request #4984 from handrews/registries

Author: ralfhandl

registry/index.md

@@ -1,17 +1,21 @@
 ---
-title: Registry
+title: Registries
 layout: default
 permalink: /registry/index.html
 has_children: true
 children:
-- title: Alternative Schema Registry
+- title: Alternative Schema Type Registry
 - title: Draft Features Registry
+- title: Specification Extension Registry
 - title: Format Registry
+- title: Media Type Registry
 - title: Namespace Registry
 - title: Tag Kinds Registry
 has_toc: false
 ---
 
+# Registries
+
 ## Contributing
 
 Please raise a [Pull-Request](https://github.com/OAI/OpenAPI-Specification/pulls) against the `gh-pages` branch and add a new Markdown file to a folder in the `registries/_{registryName}`. The name of the file is considered the registration entry, ignoring the file extension. Alternatively you can open an [Issue](https://github.com/OAI/OpenAPI-Specification/issues) to discuss a registry value.