triage label (#8665)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,7 +2,7 @@
 name: Bug report
 about: Report a bug on the latest version of Ray.
 title: ''
-labels: bug
+labels: bug, triage
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,7 +2,7 @@
 name: Feature request
 about: Suggest an idea for Ray, Tune, RLlib, etc.
 title: ''
-labels: enhancement
+labels: enhancement, triage
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/question.md

@@ -1,6 +1,6 @@
 ---
 name: Question
-about: 'Ask a question about Ray usage. '
+about: 'Ask a question about Ray usage. For possible bugs, please use the "Bug Report" template instead.'
 title: ''
 labels: question
 assignees: ''