Merge branch 'patricka-default-listener-release-aio-july-updates' of https://github.com/PatAltimore/azure-docs-pr into patricka-default-listener-release-aio-july-updates

Author: PatAltimore

articles/iot-operations/manage-mqtt-broker/howto-configure-authentication.md

@@ -160,6 +160,7 @@ metadata:
 spec:
   authenticationMethods:
     - method: x509Credentials
+      x509Credentials:
         authorizationAttributes:
           root:
             subject = "CN = Contoso Root CA Cert, OU = Engineering, C = US"