Add missing import

Author: pedrosousa

src/content/docs/waf/reference/legacy/old-rate-limiting/index.mdx

@@ -7,6 +7,8 @@ sidebar:
 noindex: true
 ---
 
+import { DashButton } from "~/components";
+
 Cloudflare Rate Limiting automatically identifies and mitigates excessive request rates for specific URLs or for an entire domain.
 
 :::caution