Add GeoIP copyright note (#1732)

pedrosousa · web-flow · commit 8f8c3929e330 · 2021-07-06T18:34:12.000+01:00
diff --git a/products/firewall/src/content/cf-firewall-language/fields.md b/products/firewall/src/content/cf-firewall-language/fields.md
@@ -896,3 +896,7 @@ The Cloudflare Firewall Rules language supports these HTTP body fields:
     </tr>
   </tbody>
 </table>
+
+---
+
+_GeoIP is the registered trademark of MaxMind, Inc._
