Make it clearer that the proxy setup is just for single-web server setups

Author: dhh

railties/lib/rails/generators/rails/app/templates/config/deploy.yml.tt

@@ -13,8 +13,8 @@ servers:
   #     - 192.168.0.1
   #   cmd: bin/jobs
 
-# Enable SSL auto certification via Let's Encrypt (and allow for multiple apps on one server).
-# Set ssl: false if using something like Cloudflare to terminate SSL (but keep host!).
+# Enable SSL auto certification via Let's Encrypt and allow for multiple apps on a single web server.
+# Remove this section when using multiple web servers and ensure you terminate SSL at your load balancer.
 proxy:
   ssl: true
   host: app.example.com