[perl6/specs] 0aa72a: Clarify a bit the $*ARGFILES in MAIN

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/perl6/specs
  Commit: 0aa72aa1d9be4dfed15bcedf759907fa83c0d6a6
      
https://github.com/perl6/specs/commit/0aa72aa1d9be4dfed15bcedf759907fa83c0d6a6
  Author: Zoffix Znet <zoffixz...@users.noreply.github.com>
  Date:   2017-07-05 (Wed, 05 Jul 2017)

  Changed paths:
    M v6d.pod

  Log Message:
  -----------
  Clarify a bit the $*ARGFILES in MAIN