moved iot hub redirects to articles/iot-hub folder

Author: JimacoMS4

.openpublishing.publish.config.json

@@ -896,7 +896,7 @@
     ".openpublishing.redirection.defender-for-cloud.json",
     ".openpublishing.redirection.defender-for-iot.json",
     ".openpublishing.redirection.healthcare-apis.json",
-    ".openpublishing.redirection.iot-hub.json",
+    "articles/iot-hub/.openpublishing.redirection.iot-hub.json",
     ".openpublishing.redirection.app-service.json",
     ".openpublishing.redirection.key-vault.json",
     ".openpublishing.redirection.sql-database.json",