Update application-gateway-crs-rulegroups-rules.md

added missing rule in drs 2.1 Ruleset

Author: Buholzer-Nick

articles/web-application-firewall/ag/application-gateway-crs-rulegroups-rules.md

@@ -392,6 +392,7 @@ The following rule groups and rules are available when using Web Application Fir
 |942100|SQL Injection Attack Detected via libinjection|
 |942110|SQL Injection Attack: Common Injection Testing Detected|
 |942120|SQL Injection Attack: SQL Operator Detected|
+|942130|SQL Injection Attack: SQL Tautology Detected.|
 |942140|SQL Injection Attack: Common DB Names Detected|
 |942150|SQL Injection Attack|
 |942160|Detects blind sqli tests using sleep() or benchmark().|