fix: Update setup-waf-config-management.md

Author: vvnginx

content/nim/nginx-app-protect/setup-waf-config-management.md

@@ -257,7 +257,7 @@ Current latest version 5.442.0 at the point of writing this document is used in
 {{%tab name="Ubuntu"%}}
 
 
-### Install on Ubuntu 24.04, 22.04, and 20.04
+### Install on Ubuntu 24.04, 22.04
 
 #### Step 1: On a system with internet access