Fixed missing import

Author: tcerqueira-cf

src/content/docs/learning-paths/secure-internet-traffic/build-dns-policies/create-list.mdx

@@ -6,6 +6,8 @@ sidebar:
 
 ---
 
+import { Tabs, TabItem } from "~/components"
+
 In the context of DNS filtering, a blocklist is a list of known harmful domains or IP addresses. An allowlist is a list of allowed domains or IP addresses, such as the domains of essential corporate applications.
 
 Gateway supports creating [lists](/cloudflare-one/policies/gateway/lists/) of URLs, hostnames, or other entries to use in your policies.