Improve design management requirements

This adds more information about how design management needs the project
to use hashed storage.

doc/user/project/issues/design_management.md

@@ -30,9 +30,11 @@ to be enabled:
   project level, navigate to your project's **Settings > General**, expand **Visibility, project features, permissions**
   and enable **Git Large File Storage**.
 
-Design Management requires that projects are using
-[hashed storage](../../../administration/repository_storage_types.md#hashed-storage)
-(the default storage type since v10.0).
+Design Management also requires that projects are using
+[hashed storage](../../../administration/raketasks/storage.md#migrate-to-hashed-storage). Since
+ GitLab 10.0, newly created projects use hashed storage by default. A GitLab admin can verify the storage type of a
+project by navigating to **Admin Area > Projects** and then selecting the project in question.
+A project can be identified as hashed-stored if its *Gitaly relative path* contains `@hashed`.
 
 If the requirements are not met, the **Designs** tab displays a message to the user.