Update API Tag to Prefix ID following LOUI-6592

Author: RebeccaTamachiro

src/content/docs/byoip/concepts/dynamic-advertisement/best-practices.mdx

@@ -66,7 +66,7 @@ Most dynamic advertisement operations require that you supply the Cloudflare ID
 1. Log in to your [Cloudflare dashboard](https://dash.cloudflare.com/) and select your account.
 2. Go to **IP Addresses** > **BYOIP Prefixes**.
 3. Find the CIDR for which you want the prefix ID, and select the arrow next to it.
-4. The prefix ID is the value under **API Tag**. Select **Copy** to add the value to your clipboard.
+4. Under **Prefix ID**, select **Copy** to add the value to your clipboard.
 
 </TabItem> <TabItem label="API">