Update config rules setting from Security Level to I'm Under Attack

Author: pedrosousa

src/content/docs/rules/configuration-rules/settings.mdx

@@ -262,17 +262,11 @@ API configuration property name: `"rocket_loader"` (boolean).
 
 </Details>
 
-## Security Level
+## I'm Under Attack
 
-[Security Level](/waf/tools/security-level/) controls Managed Challenges for requests from low reputation IP addresses.
+When enabled, [Under Attack mode](/fundamentals/reference/under-attack-mode/) performs additional security checks to help mitigate layer 7 DDoS attacks. Validated users access your website and suspicious traffic is blocked.
 
-On the Cloudflare dashboard, you can turn Under Attack mode on or off.
-
-- Off
-- Essentially Off
-- I'm Under Attack
-
-Refer to [Under Attack mode](/fundamentals/reference/under-attack-mode/) for more information.
+Use this setting to turn on or off Under Attack mode for matching requests.
 
 <Details header="API information">