Apply suggestion from @caley-b

Co-authored-by: Caley Burton <[email protected]>

Author: dcpena

src/content/docs/learning-paths/surge-readiness/security/block-agents-lock-zones.mdx

@@ -11,7 +11,7 @@ sidebar:
 Actions:
 
 - Block: Ensures that an IP address will never be allowed to access your site
--CAPTCHA Challenge: Rules will be shown a CAPTCHA before allowed access
+- CAPTCHA Challenge: Rules will be shown a CAPTCHA before allowed access
 - Javascript Challenge: Rules will be shown 5 second javascript confirmation
 
 ## Zone Lockdown