[refactor] remove unnecessary link

Author: MattDodsonEnglish

content/releases/3-0-1.md

@@ -108,7 +108,8 @@ There is a chance this may break some calendars that already exist.
 To mitigate this, ensure you set active definitions for the calendars you want to query.
 Read [About calendars and overrides]({{< relref "/how-to/work-calendars/about-calendars-and-overrides" >}}) for details about how the service and its relationships work.
 
-If you are using any JSON config files, [convert them to YAML](https://jsonformatter.org/json-to-yaml) and rename the file extension to `.yaml`.
+If you are using any JSON config files, convert them to YAML
+and rename their file extensions to `.yaml`.
 
 After you've made the necessary mitigations, follow the upgrade the [Upgrade instructions](/deploy/upgrade).