Removed Web Application Firewall

Removed Web Application Firewall (WAF) since its existence and resiliency is tied to Azure Front Door or Application Gateway. Additionally, the original article mentioned for "Availability zone guide" was incorrect since referring to Azure Firewall.

Author: Igor Pagliai

articles/reliability/overview-reliability-guidance.md

@@ -90,7 +90,6 @@ For a more detailed overview of reliability principles in Azure, see [Reliabilit
 |Azure Storage - Blob Storage|[Choose the right redundancy option](../storage/common/storage-disaster-recovery-guidance.md?toc=/azure/reliability/toc.json&bc=/azure/reliability/breadcrumb/toc.json#choose-the-right-redundancy-option)|[Azure storage disaster recovery planning and failover](../storage/common/storage-disaster-recovery-guidance.md?toc=/azure/reliability/toc.json&bc=/azure/reliability/breadcrumb/toc.json) / [Azure Blob backup](/azure/backup/blob-backup-overview)|
 |Azure Stream Analytics|| [Achieve geo-redundancy for Azure Stream Analytics jobs](../stream-analytics/geo-redundancy.md?toc=/azure/reliability/toc.json&bc=/azure/reliability/breadcrumb/toc.json) |
 |Azure Virtual WAN|[How are Availability Zones and resiliency handled in Virtual WAN?](../virtual-wan/virtual-wan-faq.md?toc=/azure/reliability/toc.json&bc=/azure/reliability/breadcrumb/toc.json#how-are-availability-zones-and-resiliency-handled-in-virtual-wan)| [Disaster recovery design](/azure/virtual-wan/disaster-recovery-design) |
-|Azure Web Application Firewall|[Deploy an Azure Firewall with Availability Zones using Azure PowerShell](../firewall/deploy-availability-zone-powershell.md?toc=/azure/reliability/toc.json&bc=/azure/reliability/breadcrumb/toc.json)|[How do I achieve a disaster recovery scenario across datacenters by using Application Gateway?](../application-gateway/application-gateway-faq.yml?#how-do-i-achieve-a-disaster-recovery-scenario-across-datacenters-by-using-application-gateway) |
 
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