[perl6/specs] a56fba: Fix bad directive: s/=head 2/=head2/;

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/perl6/specs
  Commit: a56fbac443b5322330f5c83335cf330e2934eb35
      
https://github.com/perl6/specs/commit/a56fbac443b5322330f5c83335cf330e2934eb35
  Author: Bruce Gray <bruce.g...@acm.org>
  Date:   2014-01-17 (Fri, 17 Jan 2014)

  Changed paths:
    M S05-regex.pod

  Log Message:
  -----------
  Fix bad directive: s/=head 2/=head2/;