changelog: adds note for #15062

CHANGELOG.md

@@ -20,6 +20,7 @@
 * **Units**: Add blood glucose level units mg/dL and mmol/L [#14519](https://github.com/grafana/grafana/issues/14519), thx [@kjedamzik](https://github.com/kjedamzik)
 * **Stackdriver**: Aggregating series returns more than one series [#14581](https://github.com/grafana/grafana/issues/14581) and [#13914](https://github.com/grafana/grafana/issues/13914), thx [@kinok](https://github.com/kinok)
 * **Provisioning**: Fixes bug causing infinite growth in dashboard_version table. [#12864](https://github.com/grafana/grafana/issues/12864)
+* **Piechart/Flot**: Fixes multiple piechart instances with donut bug [#15062](https://github.com/grafana/grafana/pull/15062)
 
 ### Bug fixes
 * **Search**: Fix for issue with scrolling the "tags filter" dropdown, fixes [#14486](https://github.com/grafana/grafana/issues/14486)