Revert "Nest DNSSEC keys under Advanced NS in Foundation DNS features"

This reverts commit 459ff3b.

Author: RebeccaTamachiro

src/content/docs/dns/foundation-dns/index.mdx

@@ -14,7 +14,7 @@ With Foundation DNS, you get access to increased reliability, security, and insi
   * Strategically distributed IPs to enhance resiliency
   * Reduced exposure to incidents or software regression
   * More consistent nameserver assignment
-  * DNSSEC keys unique to your zone
+* DNSSEC keys unique to your zone
 * Additional DNS settings, including:
   * [Zone defaults](/dns/additional-options/dns-zone-defaults/)
   * [Account custom nameservers](/dns/nameservers/custom-nameservers/account-custom-nameservers/)