added more content and context to devfile resources (#41)

* added more content and context to devfile resources

* removed unneeded video link

* more context to links

* revised the description of the purpose for the repos

* rephrased how to view open issues

Co-authored-by: jc-berger <>

Author: jc-berger

docs/modules/user-guide/partials/ref_devfile-samples.adoc

@@ -3,5 +3,8 @@
 
 .Additional resources
 
-* link:https://github.com/devfile/api/issues[Creating devfiles].
-* link:https://github.com/devfile/docs[Documenting devfiles].
+To view the source code for the devfile specification, visit the link:https://github.com/devfile/api[GitHub API repository].
+
+To track the development of the devfile specification, visit the link:https://github.com/devfile/api/issues[issue tracker].
+
+To build and contribute to the documentation, visit the link:https://github.com/devfile/docs[GitHub Docs repository].