Fixed design first sample code links:

src/_guides/bump-sh-tutorials/rails.md

@@ -450,4 +450,10 @@ It can also power contract testing in your existing test suite, and [openapi_con
 
 ### Sample Code
 
-The sample code for this guide is published on GitHub so you can try that if you're having trouble adding it to your application: [rails-hello-openapi](https://github.com/philsturgeon/rails-hello-openapi/).
+The sample code for this design first guide is published on GitHub, so please
+take a look at
+[rails-design-first](https://github.com/philsturgeon/rails-design-first/) if you
+need any help hooking up
+[openapi_first](https://rubygems.org/gems/openapi_first) or
+[openapi_contracts](https://rubygems.org/gems/openapi_contracts) in your
+application.