fix: correct typo in article about firewalls

Author: JMatej

sources/academy/webscraping/anti_scraping/techniques/firewalls.md

@@ -19,7 +19,7 @@ One of the most common WAFs one can come across is the one from [Cloudflare](htt
 
 ## How it works {#how-it-works}
 
-WAPs work on a similar premise as regular firewalls. Web admins define the rules, and the firewall executes them. As an example of how the WAF can work, we will take a look at Cloudflare's solution:
+WAFs work on a similar premise as regular firewalls. Web admins define the rules, and the firewall executes them. As an example of how the WAF can work, we will take a look at Cloudflare's solution:
 
 1. The visitor sends a request to the webpage.
 2. The request is intercepted by the firewall.