clarify when issue tracker is to be used so as to not contradict issue tracker...

clarify when issue tracker is to be used so as to not contradict issue tracker guidelines and maintenance policy

CONTRIBUTING.md

@@ -8,7 +8,7 @@ Issues and pull requests not in line with the guidelines listed in this document
 
 ## Issue tracker
 
-The [issue tracker](https://github.com/gitlabhq/gitlabhq/issues) is only for obvious bugs or misbehavior in the master branch of GitLab. When submitting an issue please conform to the issue submission guidelines listed below.
+The [issue tracker](https://github.com/gitlabhq/gitlabhq/issues) is only for obvious bugs or misbehavior in the latest [stable or development release of GitLab](MAINTENANCE.md). When submitting an issue please conform to the issue submission guidelines listed below.
 
 Do not use the issue tracker for feature requests. We have a specific
 [Feedback and suggestions forum](http://feedback.gitlab.com) for this purpose.