Updated issue template titles

.github/ISSUE_TEMPLATE/3-accessibility.md

 ---
-name: Accessibility problem or improvement request
+name: Accessibility issue
 about: Help make Grafana be better at keyboard navigation, screen-readable and accessible to all.
 labels: 'type: accessibility'
 ---

.github/ISSUE_TEMPLATE/4-question.md

 ---
-name: Question / Support request
+name: Support request
 about: 'Question or support request relating to using Grafana'
 title: ''
 labels: ''