changelog: add notes about closing #5699

CHANGELOG.md

@@ -30,6 +30,7 @@
 * **Table**: Renders epoch string as date if date column style [#14484](https://github.com/grafana/grafana/issues/14484)
 * **Piechart/Flot**: Fixes multiple piechart instances with donut bug [#15062](https://github.com/grafana/grafana/pull/15062)
 * **Dataproxy**: Override incoming Authorization header [#13815](https://github.com/grafana/grafana/issues/13815), thx [@kornholi](https://github.com/kornholi)
+* **Dataproxy**: Add global datasource proxy timeout setting [#5699](https://github.com/grafana/grafana/issues/5699), thx [@RangerRick](https://github.com/RangerRick)
 
 ### Bug fixes
 * **Search**: Fix for issue with scrolling the "tags filter" dropdown, fixes [#14486](https://github.com/grafana/grafana/issues/14486)