Update security-drp.liquid (#1697)

JJ asked for something along the lines of "inviting existing channel partners to request for the Security Master document"

Not sure if it would be best looking here or maybe at the end of the page

app/views/pages/developer-guide/about-platformos/security-drp.liquid

@@ -24,6 +24,7 @@ Learn more:
 * [Google Cloud Security](https://cloud.google.com/security): We take advantage of the same secure-by-design infrastructure, built-in protection, and global network that Google uses to protect your information, identities, applications, and devices.
 
 Some of our clients have contractual obligations to host services on specific IaaS (Infrastructure as a Service) providers — platformOS ensures your code runs securely, with redundancy and backups.
+Existing channel partners can [request](https://documentation.platformos.com/developer-guide/support-ticketing#email) our security master document for more information.
 
 ## Data backups