Merge pull request #104863 from msrini-MSFT/patch-103

(AzureCXP) fixes MicrosoftDocs/azure-docs#48191

Author: PRMerger14

articles/web-application-firewall/ag/configure-waf-custom-rules.md

@@ -104,6 +104,8 @@ $sku = New-AzApplicationGatewaySku -Name WAF_v2 -Tier WAF_v2
 ### Create two custom rules and apply it to WAF policy
 
 ```azurepowershell
+# Create WAF config
+$wafConfig = New-AzApplicationGatewayWebApplicationFirewallConfiguration -Enabled $true -FirewallMode "Prevention" -RuleSetType "OWASP" -RuleSetVersion "3.0"
 # Create a User-Agent header custom rule 
 $variable = New-AzApplicationGatewayFirewallMatchVariable -VariableName RequestHeaders -Selector User-Agent
 $condition = New-AzApplicationGatewayFirewallCondition -MatchVariable $variable -Operator Contains -MatchValue "evilbot" -Transform Lowercase -NegationCondition $False