Add descriptions about Max function

Added descriptions about Max function to the price calculation examples.

Author: tksh164

articles/application-gateway/application-gateway-autoscaling-zone-redundant.md

@@ -80,6 +80,8 @@ Capacity unit price = 744(hours) * Max (25/50 compute unit for connections/sec,
 
 Total price = $148.8+23.81 = $172.61
 
+Note: The Max function returns the largest value in a pair of values.
+
 **Example 3**
 
 An Application Gateway WAF_v2 is provisioned for a month. During this time, it receives 25 new SSL connections/sec, average of 8.88-Mbps data transfer and does 80 request per second. Assuming connections are short lived, and that compute unit calculation for the application supports 10 RPS per compute unit, your price would be:
@@ -90,6 +92,8 @@ Capacity unit price = 744(hours) * Max (compute unit Max(25/50 for connections/s
 
 Total price = $267.84 + $85.71 = $353.55
 
+Note: The Max function returns the largest value in a pair of values.
+
 ## Scaling Application Gateway and WAF v2
 
 Application Gateway and WAF can be configured to scale in two modes:
@@ -147,4 +151,4 @@ An Azure PowerShell script is available in the PowerShell gallery to help you mi
 - [Quickstart: Direct web traffic with Azure Application Gateway - Azure portal](quick-create-portal.md)
 - [Create an autoscaling, zone redundant application gateway with a reserved virtual IP address using Azure PowerShell](tutorial-autoscale-ps.md)
 - Learn more about [Application Gateway](overview.md).
-- Learn more about [Azure Firewall](../firewall/overview.md).
+- Learn more about [Azure Firewall](../firewall/overview.md).