Update articles/web-application-firewall/afds/afds-overview.md

Co-Authored-By: Vic <[email protected]>

Author: teresayao

articles/web-application-firewall/afds/afds-overview.md

@@ -88,7 +88,7 @@ Default action is to BLOCK. In addition, custom rules can be configured in the s
 Custom rules are always applied before rules in the Default Rule Set are evaluated. If a request matches a custom rule, corresponding rule action is applied, and the request is either blocked or passed through to back-end, without invocation of any further custom rules or the rules in the Default Rule Set. Furthermore, you have the option to remove Default Rule Set from your WAF policies.
 
 
-### Bot protection rule (preview)
+### Bot protection rule set (preview)
 A managed bot protection rule set can be enabled for your WAF to take custom actions on requests from known bot categories. There are three bot categories supported: Bad Bots, Good Bots, and Unknown Bots. Bot signatures are managed and dynamically updated by the WAF platform. Malicious IP addresses for Bad Bots are sourced from the Microsoft Threat Intelligence feed. [Intelligent Security Graph](https://www.microsoft.com/security/operations/intelligence) powers Microsoft Threat Intelligence and is used by multiple services including Azure Security Center. Good Bots include validated search engines. Unknown categories include additional bot groups. You may set custom actions to block, allow, log, or redirect for different types of bots.