Mention both CE and EE issue trackers in description templates

[skip ci]

.gitlab/issue_templates/Bug.md

 Please read this!
 
 Before opening a new issue, make sure to search for keywords in the issues
-filtered by the "regression" or "bug" label:
+filtered by the "regression" or "bug" label.
+
+For the Community Edition issue tracker:
 
 - https://gitlab.com/gitlab-org/gitlab-ce/issues?label_name%5B%5D=regression
 - https://gitlab.com/gitlab-org/gitlab-ce/issues?label_name%5B%5D=bug
 
+For the Enterprise Edition issue tracker:
+
+- https://gitlab.com/gitlab-org/gitlab-ee/issues?label_name%5B%5D=regression
+- https://gitlab.com/gitlab-org/gitlab-ee/issues?label_name%5B%5D=bug
+
 and verify the issue you're about to submit isn't a duplicate.
 
 Please remove this notice if you're confident your issue isn't a duplicate.

.gitlab/issue_templates/Feature Proposal.md

@@ -3,8 +3,14 @@ Please read this!
 Before opening a new issue, make sure to search for keywords in the issues
 filtered by the "feature proposal" label:
 
+For the Community Edition issue tracker:
+
 - https://gitlab.com/gitlab-org/gitlab-ce/issues?label_name%5B%5D=feature+proposal
 
+For the Enterprise Edition issue tracker:
+
+- https://gitlab.com/gitlab-org/gitlab-ee/issues?label_name%5B%5D=feature+proposal
+
 and verify the issue you're about to submit isn't a duplicate.
 
 Please remove this notice if you're confident your issue isn't a duplicate.