Minor improvements on documenting comments

Author: bgandon

ddbox-env/features/enable-vbox-port-forwarding.yml

@@ -2,6 +2,10 @@
 
 # Only NAT (not NATNet) allows us to expose ports to the internet.
 # See: <https://forums.virtualbox.org/viewtopic.php?f=7&t=82039#p386722>
+#
+# The problem is that when Virtulbox is running as a standard non-root Linux
+# user (which is our use-case for the moment), then ports below 1024 cannot be
+# bound using this 'nat' network feature.
 
 - type: replace
   path: /networks/-

deployments/rabbitmq/conf/spec.yml

@@ -77,7 +77,7 @@ deployment_vars:
 
   # Plumbery
 
-  rabbitmq-management-username: admin # used by human ops when connecting to rabbit
+  rabbitmq-management-username: admin # used by human ops when connecting to rabbit (optional, set this to ~ in order to disable)
   rabbitmq-broker-username: broker # used by broker to access rabbit
   multitenant-rabbitmq-broker-username: capi # used by CC when connecting to the broker