[perl6/specs] c3fa8e: remove sig collision with placeholders

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/perl6/specs
  Commit: c3fa8ea69fa83952a051def86c5d4abbf19a8b53
      
https://github.com/perl6/specs/commit/c3fa8ea69fa83952a051def86c5d4abbf19a8b53
  Author: Larry Wall <la...@wall.org>
  Date:   2013-11-17 (Sun, 17 Nov 2013)

  Changed paths:
    M S17-concurrency.pod

  Log Message:
  -----------
  remove sig collision with placeholders