[DNS] Note rate limit for Import records API (cloudflare#23709)

Author: RebeccaTamachiro

src/content/docs/dns/manage-dns-records/how-to/import-and-export.mdx

@@ -11,9 +11,10 @@ Use import and export to have more control over your DNS records and make proces
 
 ## Import records
 
-:::caution
- <Render file="zone-file-size-limit" />
-:::
+### Limits
+
+- <Render file="zone-file-size-limit" />
+- The API rate limit is three requests per minute per user.
 
 ### Format your zone file