Update docs/hypernode-platform/ssl/how-to-use-a-custom-ssl-certificate-on-hypernode.md

Co-authored-by: Timon de Groot <tdegroot96@gmail.com>

Author: moon-hn

docs/hypernode-platform/ssl/how-to-use-a-custom-ssl-certificate-on-hypernode.md

@@ -127,7 +127,7 @@ This check protects HTTPS requests handled by the configured Nginx server blocks
 
 #### Download the Cloudflare Certificate
 
-Log into your Hypernode using SSH as the app user. Create the certificate directory and download the Authenticated Origin Pull CA certificate.
+Log into your Hypernode using SSH as the app user. Create the certificate directory and download the [Authenticated Origin Pull CA certificate](https://developers.cloudflare.com/ssl/static/authenticated_origin_pull_ca.pem).
 
 ```bash
 mkdir -p /data/web/nginx/ssl