Adding information to format of caPool option

The current information for the caPool option is a bit vauge on what to actually enter here.

Added information provided by another CF Employee to the doc.

Author: dledfordcf

src/content/docs/cloudflare-one/connections/connect-networks/configure-tunnels/origin-configuration.mdx

@@ -26,6 +26,8 @@ Hostname that `cloudflared` should expect from your origin server certificate. I
 
 Path to the certificate authority (CA) for the certificate of your origin. This option should be used only if your certificate is not signed by Cloudflare.
 
+*Format:* The CA Pool option typically expects a path to a certificate store file or a bundle file in .pem or .crt format. This file should contain one or more trusted root CA certificates. It’s usually not a URL; rather, it’s a local file path where your trusted certificates are stored.
+
 ### noTLSVerify
 
 | Default | UI name       |