Private to public: release note for Hub 09/05 (#9408)

* Release note for Hub 09/05/19 release

Signed-off-by: Lena Larionova <lena.larionova@docker.com>

* Rewording stuff per comments from Serj

_data/toc.yaml

@@ -3994,6 +3994,8 @@ manuals:
   section:
   - path: /docker-hub/
     title: Quickstart
+  - path: /docker-hub/release-notes/
+    title: Release notes
   - path: /docker-hub/repos/
     title: Repositories
   - path: /docker-hub/official_images/

docker-hub/release-notes.md

@@ -0,0 +1,25 @@
+---
+title: Docker Hub release notes
+description: Learn about the new features, bug fixes, and breaking changes for Docker Hub
+keywords: docker hub, whats new, release notes
+toc_max: 2
+---
+
+Here you can learn about the latest changes, new features, bug fixes, and known
+issues for each Docker Hub release.
+
+## 2019-09-05
+
+### Enhancements
+
+* The `Tags` tab on an image page now provides additional information for each tag:
+  * A list of digests associated with the tag
+  * The architecture it was built on
+  * The OS
+  * The user who most recently updated an image for a specific tag
+* The security scan summary for [official images](https://docs.docker.com/docker-hub/official_images/) 
+has been updated.
+
+### Known Issues
+
+* Scan results don't appear for some official images.