Remove 6.2 versionchanged note in frontend cache docs

docs/reference/contrib/frontendcache.md

@@ -105,10 +105,6 @@ WAGTAILFRONTENDCACHE = {
 }
 ```
 
-```{versionchanged} 6.2
-Previous versions allowed passing a dict for `DISTRIBUTION_ID` to allow specifying different distribution IDs for different hostnames. This is now deprecated; instead, multiple distribution IDs should be defined as [multiple backends](frontendcache_multiple_backends), with a `HOSTNAMES` parameter to define the hostnames associated with each one.
-```
-
 `boto3` will attempt to discover credentials itself. You can read more about this here: [Boto 3 Docs](https://boto3.amazonaws.com/v1/documentation/api/latest/guide/configuration.html). The user will need a policy similar to:
 
 ```json