Update application-gateway-waf-metrics.md

removing the preview language around the AGC WAF limitation with JSC

Author: Miskatonic-Electronic

articles/web-application-firewall/ag/application-gateway-waf-metrics.md

@@ -47,7 +47,7 @@ New WAF metrics are only available for Core Rule Set 3.2 or greater, or with bot
 
 <sup>2</sup> Rule name for custom rules and Rule ID for the Bot Manager Rule Set.
 
-<sup>3</sup> Application Gateway for Containers WAF does not support JavaScript challenge in preview.
+<sup>3</sup> Application Gateway for Containers WAF does not support JavaScript challenge.
 
 For metrics supported by Application Gateway V2 SKU, see [Application Gateway v2 metrics](../../application-gateway/application-gateway-metrics.md#metrics-supported-by-application-gateway-v2-sku)