Minor update to readme

README.md

@@ -4,7 +4,7 @@ Manages [foreign travel advice content on GOV.UK](https://www.gov.uk/foreign-tra
 
 ## Technical documentation
 
-This is a Ruby on Rails app, and should follow [our Rails app conventions](https://docs.publishing.service.gov.uk/manual/conventions-for-rails-applications.html).
+This is a Ruby on Rails application, and should follow [our Rails app conventions](https://docs.publishing.service.gov.uk/manual/conventions-for-rails-applications.html).
 
 You can use the [GOV.UK Docker environment](https://github.com/alphagov/govuk-docker) to run the application and its tests with all the necessary dependencies. Follow [the usage instructions](https://github.com/alphagov/govuk-docker#usage) to get started.