Merge pull request #125185 from yuvalpery/patch-4

Update waf-engine.md

Author: Jak-MS

articles/web-application-firewall/ag/waf-engine.md

@@ -32,6 +32,7 @@ There are many new features that are only supported in the Azure WAF engine. The
 * [CRS 3.2](application-gateway-crs-rulegroups-rules.md#owasp-crs-32)
   * Increased request body size limit to 2 MB
   * Increased file upload limit to 4 GB
+* [DRS 2.1](application-gateway-crs-rulegroups-rules.md#drs-21) and later DRS versions
 * [WAF v2 metrics](application-gateway-waf-metrics.md#application-gateway-waf-v2-metrics)
 * [Per rule exclusions](application-gateway-waf-configuration.md#per-rule-exclusions) and support for [exclusion attributes by name](application-gateway-waf-configuration.md#request-attributes-by-keys-and-values).
 * [Increased scale limits](../../azure-resource-manager/management/azure-subscription-service-limits.md#application-gateway-limits)