Add new articles to release candidate guide

Author: sofietoft

15/umbraco-cms/SUMMARY.md

@@ -109,7 +109,7 @@
   * [Using Umbraco services](reference/management/using-services/README.md)
     * [Content Type Service](reference/management/using-services/contenttypeservice.md)
 * [Management API](reference/management-api/README.md)
-    * [External Access](reference/management-api/external-access.md)
+  * [External Access](reference/management-api/external-access.md)
 * [Cache & Distributed Cache](reference/cache/README.md)
   * [Cache Seeding](reference/cache/cache-seeding.md)
   * [Examples](reference/cache/examples/README.md)

15/umbraco-cms/release-candidate-guide.md

@@ -67,6 +67,14 @@ Here is a list of all the articles that are new to this version or have been upd
 * [Creating a Custom Seed Key Provider](extending/creating-custom-seed-key-provider.md)
 * [Cache Settings](reference/configuration/cache-settings.md)
 * [Cache Seeding](reference/cache/cache-seeding.md)
+* [API Users](fundamentals/data/users/api-users.md)
+* [External Access](reference/management-api/external-access.md)
+
+* New UI for the Rich Text Editor: Tiptap
+  * [Rich Text Editor](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/rich-text-editor/README.md)
+    * [Configuration](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/rich-text-editor/configuration.md)
+    * [Blocks](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/rich-text-editor/blocks.md)
+    * [Change Rich Text Editor UI](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/rich-text-editor/change-rich-text-editor-ui.md)
 
 ### Updated articles