Update test-and-deploy-ruby-application-to-heroku.md

doc/ci/examples/test-and-deploy-ruby-application-to-heroku.md

@@ -34,7 +34,7 @@ production:
 This project has three jobs:
 1. `test` - used to test Rails application,
 2. `staging` - used to automatically deploy staging environment every push to `master` branch
-3. `production` - used to automatically deploy production environmnet for every created tag
+3. `production` - used to automatically deploy production environment for every created tag
 
 ### Store API keys
 You'll need to create two variables in `Project > Variables`: