Update docs/docs/configuration/providers/openid_connect.md

Co-authored-by: Koen van Zuijlen <[email protected]>

docs/docs/configuration/providers/openid_connect.md

@@ -124,7 +124,7 @@ Then you can start the oauth2-proxy with `./oauth2-proxy --config /etc/example.c
 4. Make note of the `Client ID` and `Client secret`, they are needed in a future step
 5. Make note of the **default** Authorization Server Issuer URI from: https://$\{your-okta-domain\}/admin/oauth2/as
 6. Example config file `/etc/localhost.cfg`
-    ```
+    ```shell
     provider = "oidc"
     redirect_url = "http://localhost:4180/oauth2/callback"
     oidc_issuer_url = "https://$\{your-okta-domain\}/oauth2/default"