remove X.509

Author: v-stadam

articles/iot-edge/TOC.yml

@@ -135,8 +135,6 @@
       href: how-to-update-iot-edge.md
   - name: Auto-provision with DPS
     items:
-    - name: X.509 attestation
-      href: how-to-auto-provision-x509-certificates.md
     - name: TPM attestation
       items:
       - name: Linux

articles/iot-edge/how-to-auto-provision-symmetric-keys.md

@@ -5,7 +5,7 @@ author: kgremban
 manager: philmea
 ms.author: kgremban
 ms.reviewer: mrohera
-ms.date: 09/20/2019
+ms.date: 10/04/2019
 ms.topic: conceptual
 ms.service: iot-edge
 services: iot-edge