Merge branch 'docs/minor-improvement-on-resources-doc' into 'master'

Minor improvement on resources doc

See merge request gitlab-org/gitlab-ce!28589

qa/qa/resource/README.md

 # Resource class in GitLab QA
 
 Resources are primarily created using Browser UI steps, but can also
-be created via the API.
+be created via the API or the CLI.
 
 ## How to properly implement a resource class?