Revert changes to access-control and remove Workers admin binding

Author: RebeccaTamachiro

src/content/docs/secrets-store/access-control.mdx

@@ -11,4 +11,9 @@ Secrets Store allows security administrators to have more control, by implementi
 
 - (TBC)**Secrets Store admin**:
 - **Super administrator**: Can create, edit, delete, and view secrets. Can also add the binding to access a Secrets Store secret to a `wrangler.toml` file.
-- (TBC)**Workers admin**: Cannot create, edit, nor delete secrets. Can add the binding to access a Secrets Store secret to a `wrangler.toml` file.
+
+## Assign permissions
+
+Super administrators can grant create/edit/delete permissions to other users via the following API call:
+
+(TBC)