Fix RSpec/MissingExampleGroupArgument cop (#25310)

spec/controllers/admin/users/roles_controller_spec.rb

@@ -40,7 +40,7 @@ describe Admin::Users::RolesController do
       put :update, params: { user_id: user.id, user: { role_id: selected_role.id } }
     end
 
-    context do
+    context 'with manage roles permissions' do
       let(:permissions) { UserRole::FLAGS[:manage_roles] }
       let(:position) { 1 }