changelog: improve description of closed issues

CHANGELOG.md

@@ -18,8 +18,8 @@
 # 5.0.2 (2018-03-14)
 * **Mysql**: Mysql panic occurring occasionally upon Grafana dashboard access [#11155](https://github.com/grafana/grafana/issues/11155)
 * **Dashboards**: Should be possible to browse dashboard using only uid [#11231](https://github.com/grafana/grafana/issues/11231)
-* **Alerting**: Alerts from hidden panels [#11222](https://github.com/grafana/grafana/issues/11222)
-* **Import**: Can't import or save new dashboards if their graphs have alerts configured [#11227](https://github.com/grafana/grafana/issues/11227)
+* **Alerting**: Fixes bug where alerts from hidden panels where deleted [#11222](https://github.com/grafana/grafana/issues/11222)
+* **Import**: Fixes bug where dashboards with alerts couldn't be imported [#11227](https://github.com/grafana/grafana/issues/11227)
 * **Teams**: Remove quota restrictions from teams [#11220](https://github.com/grafana/grafana/issues/11220)
 
 # 5.0.1 (2018-03-08)