[docs] Fix debug

docs/site/content/en/docs/how-to/sessions/index.md

@@ -84,7 +84,7 @@ Read more about it in [Autostart section](#autostart).
 You can configure proxy when for all sessions by set up environment variables.
 Read more about it on [**Configuration page** ->]({{< relref "/docs/how-to/config#proxy" >}}).
 
-**Enable debug**
+#### Enable debug
 You can enable debug mode for a session by setting `config.debug` field to `true`.
 It'll show you more logs in the console.
 Can be useful for debugging purposes when you're experiencing some issues.