Add subscript to issue templates

Author: otelbot[bot]

.github/ISSUE_TEMPLATE/bug_report.md

@@ -75,3 +75,5 @@ end
 
 OpenTelemetry.tracer_provider.shutdown
 ```
+
+<sub>**Tip**: [React](https://github.blog/news-insights/product-news/add-reactions-to-pull-requests-issues-and-comments/) with 👍 to help prioritize this issue. Please use comments to provide useful context, avoiding `+1` or `me too`, to help us triage it. Learn more [here](https://opentelemetry.io/community/end-user/issue-participation/).</sub>