Update content/nginx-one/nap-integration/add-signature-sets.md

Co-authored-by: Mike Jang <[email protected]>

Author: sylwang

content/nginx-one/nap-integration/add-signature-sets.md

@@ -13,6 +13,7 @@ This document describes how you can configure signature sets and signature excep
 Attack signatures are rules or patterns that identify attack sequences or classes of attacks on a web application. F5 WAF for NGINX includes predefined attack signatures grouped into signature sets.
 
 ### Signature set
+
 A **signature set** is a collection of attack signatures with a specific name and purpose. These sets are predefined and can be enabled or disabled in your policy. 
 
 For example, you might have sets for SQL Injection Signatures, Cross-Site Scripting Signatures, or Buffer Overflow Signatures.