Update deprecation entry for custom roles to include the API changes

data/deprecations/17-0-custom-role-creation.yml

@@ -10,3 +10,9 @@
     Group Owners will be able to assign custom roles at the group level.
 
     Group owners on GitLab.com can continue to manage custom roles and assign at the group level.
+
+    If using the API to manage custom roles on a self-managed instance, a new instance endpoint has been added and is required to continue API operations.
+
+    - List all member roles on the instance - `GET /api/v4/member_roles`
+    - Add member role to the instance - `POST /api/v4/member_roles`
+    - Remove member role from the instance - `DELETE /api/v4/member_roles/:id`

doc/update/deprecations.md

@@ -932,6 +932,12 @@ Group Owners will be able to assign custom roles at the group level.
 
 Group owners on GitLab.com can continue to manage custom roles and assign at the group level.
 
+If using the API to manage custom roles on a self-managed instance, a new instance endpoint has been added and is required to continue API operations.
+
+- List all member roles on the instance - `GET /api/v4/member_roles`
+- Add member role to the instance - `POST /api/v4/member_roles`
+- Remove member role from the instance - `DELETE /api/v4/member_roles/:id`
+
 </div>
 
 <div class="deprecation breaking-change" data-milestone="17.0">