changelog: add notes about closing #11771

[skip ci]

CHANGELOG.md

@@ -21,6 +21,7 @@
 * **Sidenav**: Show create dashboard link for viewers if at least editor in one folder [#11858](https://github.com/grafana/grafana/issues/11858)
 * **SQL**: Second epochs are now correctly converted to ms. [#12085](https://github.com/grafana/grafana/pull/12085)
 * **Singlestat**: Fix singlestat threshold tooltip [#11971](https://github.com/grafana/grafana/issues/11971)
+* **Dashboard**: Hide grid controls in fullscreen/low-activity views [#11771](https://github.com/grafana/grafana/issues/11771)
 
 # 5.1.3 (2018-05-16)