AMQ_GLOBAL_MAX_SIZE description and default value don't match

[tux-o-matic]

The description for the AMQ_GLOBAL_MAX_SIZE ENV describe a default that is way too high and not the one actually applied. GLOBAL_MAX_SIZEis the right parameter, in its absence, half the Xmx will be et as max global size.

- description: "Maximum amount of memory which message data may consume (Default: Undefined, half of the system's memory)."
  displayName: AMQ Global Max Size
  name: AMQ_GLOBAL_MAX_SIZE
  value: 100 gb

This oddity is still present in the 7.7 template.