Update Konnect curl request in renew-certificates.md

- needed to add double-quotes to properly expand $CERT envvar (curl was giving an error)
- Included the Authorization header in the Konnect request

app/konnect/gateway-manager/data-plane-nodes/renew-certificates.md

@@ -75,7 +75,8 @@ You can generate a certificate locally and use the [pin data plane client certif
 1. `POST` the certificate to your control plane using the Konnect API:
 
     ```bash
-    curl https://{region}.api.konghq.com/v2/control-planes/{controlPlaneId}/dp-client-certificates --json '{"cert":"'$CERT'"}'
+    curl https://{region}.api.konghq.com/v2/control-planes/{controlPlaneId}/dp-client-certificates --json '{"cert":"'"$CERT"'"}' \
+       --header "Authorization: Bearer ${KONNECT_TOKEN}"
     ```
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