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

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

website/docs/troubleshooting/missing_permission.md

@@ -8,13 +8,13 @@ The error should be temporary and not occur after initial installation.
 
 If it does, you can run the following command to ensure all permissions exist:
 
-```
+```shell
 docker compose run --rm worker repair_permissions
 ```
 
 or, for Kubernetes, run
 
-```
+```shell
 kubectl exec -it deployment/authentik-worker -c authentik -- ak repair_permissions
 ```