adding naming restrictions and fixing page

Author: ElazarK

articles/defender-for-cloud/custom-security-policies.md

@@ -3,7 +3,7 @@ title: Create custom Azure security policies in Microsoft Defender for Cloud
 description: Azure custom policy definitions monitored by Microsoft Defender for Cloud.
 ms.topic: how-to
 ms.custom: ignite-2022
-ms.date: 07/20/2022
+ms.date: 01/10/2023
 zone_pivot_groups: manage-asc-initiatives
 ---