Fix changelog formatting for 3.0.0-beta7 (#4905)

CHANGELOG.md

@@ -4,7 +4,7 @@
 * **Dashboard title**: Fixed max dashboard title width (media query) for large screens,  fixes [#4859](https://github.com/grafana/grafana/issues/4859)
 * **Annotations**: Fixed issue with entering annotation edit view, fixes [#4857](https://github.com/grafana/grafana/issues/4857)
 * **Remove query**: Fixed issue with removing query for data sources without collapsable query editors, fixes [#4856](https://github.com/grafana/grafana/issues/4856)
-* **Graphite PNG*: Fixed issue graphite png rendering option, fixes [#4864](https://github.com/grafana/grafana/issues/4864)
+* **Graphite PNG**: Fixed issue graphite png rendering option, fixes [#4864](https://github.com/grafana/grafana/issues/4864)
 * **InfluxDB**: Fixed issue missing plus group by iconn, fixes [#4862](https://github.com/grafana/grafana/issues/4862)
 * **Graph**: Fixes missing line mode for thresholds, fixes [#4902](https://github.com/grafana/grafana/pull/4902)