Small structure changes

Author: sofietoft

15/umbraco-cms/SUMMARY.md

@@ -172,13 +172,15 @@
     * [Extension Registration](customizing/extending-overview/extension-registry/extension-registry.md)
     * [Extension Manifest](customizing/extending-overview/extension-registry/extension-manifest.md)
   * [Extension Types](customizing/extending-overview/extension-types/README.md)
+    * [Sections](customizing/extending-overview/extension-types/sections/README.md)
+    * [Workspaces](customizing/extending-overview/extension-types/workspaces/README.md)
+      * [Modals](customizing/extending-overview/extension-types/modals/README.md)
+    * [Confirm Dialog](customizing/extending-overview/extension-types/modals/confirm-dialog.md)
+    * [Custom Modals](customizing/extending-overview/extension-types/modals/custom-modals.md)
+    * [Route Registration](customizing/extending-overview/extension-types/modals/route-registration.md)
     * [Menu](customizing/extending-overview/extension-types/menu.md)
     * [Header Apps](customizing/extending-overview/extension-types/header-apps.md)
     * [Icons](customizing/extending-overview/extension-types/icons.md)
-    * [Modals](customizing/extending-overview/extension-types/modals/README.md)
-      * [Confirm Dialog](customizing/extending-overview/extension-types/modals/confirm-dialog.md)
-      * [Custom Modals](customizing/extending-overview/extension-types/modals/custom-modals.md)
-      * [Route Registration](customizing/extending-overview/extension-types/modals/route-registration.md)
     * [Bundle](customizing/extending-overview/extension-types/bundle.md)
     * [Kind](customizing/extending-overview/extension-types/kind.md)
     * [Backoffice Entry Point](customizing/extending-overview/extension-types/backoffice-entry-point.md)