[doc] Add and modify work done in 2.9 release

ReleaseNotes-2.9

@@ -27,30 +27,20 @@ happen automatically.
 Features
 ========
 
-UI:
- * Kerberos authentication mode. Allow OBS admins to setup their instance for
-   kerberos authentication. Read more in the OBS Admin Guide.
- * Users can see the job history list of a specific package via the package binaries page
- * New GPG key details dialog
- * RSS Feeds for User's Notifications is now available
- * Kiwi image editor feature:
-   * Repositories of a kiwi file can be updated. Also the packages list.
-   * A basic and expert mode for adding repositories is available.
-   * obsrepositories:/ source_path can be added easily using 'use project repositories' checkbox.
-   * Only `apt-deb` and `rpm-md` are allowed as repo_type. Other values will be replaced by `rpm-md`.
-   * Added autocompletion for binary packages names.
-   * Kiwi Editor tab now appears as "Image Editor", the rest of the tabs are under "Advanced".
-   * After an image template is branched the user will be redirected to the Image Editor.
- * Job history: 'source change' rows now link to the diff
- * RabbitMQ support. OBS admins can configure their instance to send messages to a RabbitMQ server.
-   Read more in the OBS Admin Guide.
+Frontend:
+ * New Kerberos authentication mode. Read how to setup Kerberos in the OBS Admin Guide: http://openbuildservice.org/help/manuals/obs-admin-guide/
+ * New job history page to see why a package was built.
+ * New GPG key details dialog.
+ * RSS Feeds for User's Notifications is now available.
+ * New Studio Express feature:
+   * New central page to branch image templates from.
+   * Add and edit repository and package lists in kiwi files.
+   * Edit kiwi image details: name, author, contact, specification.
+ * RabbitMQ support. OBS admins can configure their instance to send messages to a RabbitMQ server. Read more in the OBS Admin Guide.
  * Receive email notifications for projects that are in your watchlist. Configure at /user/notifications.
  * Improved UI/UX for configuration of notifications page. Now it shows a better layout and explanations to make this complex page easy to understand.
-
-API:
- * Kerberos authentication mode
- * api_relative_url_root option was removed
- * An error is raised if delayed_jobs is down
+ * Allow users to view the full diff of large changes.
+ * Remove the unused api_relative_url_root option from the options.yml file.
 
 Backend:
  * support showing source files in blame view (works also via links)
@@ -60,9 +50,11 @@ Shipment:
  *
 
 Bugfixes:
- * Deletion of groups with users was not working
- * Fixed generation of the breadcrumb for the Image Editor (Kiwi)
- * Using ActiveSupport::JSON as encoder everywhere prevent to fail on Notification creation with events that have a very big payload
+ * Fix deletion of groups with users.
+ * Fix notification generation with very big payloads.
+ * Create history element on priority raise of request.
+ * Fix huge bottleneck in notification emails.
+ * Fix setting of new attributes to a project or package.
 
 Wanted changes:
 ===============