Added correct format. (#45562)

docs/sources/whatsnew/whats-new-in-v8-4.md

@@ -24,9 +24,9 @@ You can now share links to your playlists the same way as with dashboards, to ea
 
 {{< figure src="/static/img/docs/dashboards/share-playlists-8-4.png" max-width="1200px" caption="Share playlist" >}}
 
-### `$**interval` and `$**interval_ms` in panel title
+### `$__interval` and `$__interval_ms` in panel title
 
-We’ve expanded the functionality of this existing and popular feature. You can now use `$**interval` and `$**interval_ms` in panel titles. This new function displays the interval that’s used in a specific panel without requiring edit mode.
+We’ve expanded the functionality of this existing and popular feature. You can now use `$__interval` and `$__interval_ms` in panel titles. This new function displays the interval that’s used in a specific panel without requiring edit mode.
 
 {{< figure src="/static/img/docs/panels/interval-8-4.png" max-width="1200px" caption="Time intervals" >}}