website/docs: ensure yaml code blocks have language tags (#9240)

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

website/docs/troubleshooting/login.md

@@ -10,19 +10,19 @@ This recovery key will give whoever has the link direct access to your instances
 
 To create the key, run the following command:
 
-```
+```shell
 docker compose run --rm server create_recovery_key 10 akadmin
 ```
 
 For Kubernetes, run
 
-```
+```shell
 kubectl exec -it deployment/authentik-worker -c authentik -- ak create_recovery_key 10 akadmin
 ```
 
 or, for CLI, run
 
-```
+```shell
 ak create_recovery_key 10 akadmin
 ```