Corrected spelling mistake in the document

Corrected the spelling mistake for the word "Visibility" in the document

Author: shivsidhu

articles/web-application-firewall/afds/waf-front-door-drs.md

@@ -55,7 +55,7 @@ If the anomaly score is 5 or greater, WAF blocks the request.
 
 For example, a single *Critical* rule match is enough for the WAF to block a request, because the overall anomaly score is 5. However, one *Warning* rule match only increases the anomaly score by 3, which isn't enough by itself to block the traffic.
 
-When your WAF uses older version of the default rule set (before DRS 2.0), your WAF runs in the traditional mode. Traffic that matches any rule is considered independently of any other rule matches. In traditional mode, you don't have visiblity into the complete set of rules that a specific request matched.
+When your WAF uses older version of the default rule set (before DRS 2.0), your WAF runs in the traditional mode. Traffic that matches any rule is considered independently of any other rule matches. In traditional mode, you don't have visibility into the complete set of rules that a specific request matched.
 
 The version of the DRS that you use also determines which content types are supported for request body inspection. For more information, see [What content types does WAF support?](waf-faq.yml#what-content-types-does-waf-support-) in the FAQ.