[perl6/specs] a964d4: Fix typo

[email protected] (GitHub)
Newsgroups perl.perl6.language
Message-ID <558a085fa1479_2f913fe9350392c0451e1@hookshot-fe3-cp1-prd.iad.github.net.mail> 
  Branch: refs/heads/master
  Home:   https://github.com/perl6/specs
  Commit: a964d4bd6aa84919a21e0d5c160968e8c31279ab
      https://github.com/perl6/specs/commit/a964d4bd6aa84919a21e0d5c160968e8c31279ab
  Author: Rob Hoelz <[email protected]>
  Date:   2015-06-23 (Tue, 23 Jun 2015)

  Changed paths:
    M S32-setting-library/IO.pod

  Log Message:
  -----------
  Fix typo
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