Clarify zonal resiliency configuration options

Updated the section on zonal resiliency to clarify the HA server creation options and the fallback mechanism.

Author: gaurikasar

articles/reliability/reliability-azure-database-postgresql.md

@@ -48,7 +48,7 @@ The **zonal** deployment option is available in all [Azure regions](/azure/postg
 
 You can configure high availability (HA) in two ways: zone-redundant HA, which places the standby server in a different availability zone for maximum resiliency, or same-zone HA, which deploys the standby server in the same zone as the primary server to minimize latency.
 
-To simplify configuration and ensure zonal resiliency, the portal provides a Zonal Resiliency option with two radio buttons: Enabled and Disabled. Selecting Enabled attempts to create the standby server in a different availability zone (zone-redundant HA mode). If the region doesn't support zone-redundant HA, you can select the fallback checkbox (highlighted in the following image) to enable same-zone HA instead.
+The **'Business Critical (High Availability)'** section provides an option to create an HA server with **zonal resiliency**. To simplify configuration and ensure zonal resiliency, the portal provides a Zonal Resiliency option with two radio buttons: Enabled and Disabled. Selecting Enabled attempts to create the standby server in a different availability zone (zone-redundant HA mode). If the region doesn't support zone-redundant HA, you can select the fallback checkbox (highlighted in the following image) to enable same-zone HA instead.
 
 :::image type="content" source="media/reliability-azure-database-postgresql/multi-availability-zones.png" alt-text="Screenshot of the zonal resiliency experience in the portal." lightbox="./media/reliability-azure-database-postgresql/multi-availability-zones.png":::