[perl6/specs] 039bbf: Some code example tweaks

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/perl6/specs
  Commit: 039bbfdbf86308975581a690fca9801d499cff6a
      
https://github.com/perl6/specs/commit/039bbfdbf86308975581a690fca9801d499cff6a
  Author: Elizabeth Mattijsen <l...@dijkmat.nl>
  Date:   2013-11-05 (Tue, 05 Nov 2013)

  Changed paths:
    M S17-concurrency.pod

  Log Message:
  -----------
  Some code example tweaks