Clarify comment

Author: andyw8

test/ruby_lsp_rails/runner_client_test.rb

@@ -21,7 +21,7 @@ class RunnerClientTest < ActiveSupport::TestCase
       end
 
       test "#model returns information for the requested model" do
-        # test/dummy/db/migrate/20230330202955_create_users.rb
+        # These columns are from the schema in the dummy app: test/dummy/db/schema.rb
         columns = [
           ["id", "integer"],
           ["first_name", "string"],