[parrot/parrot] e87d3d: Fix typo in sha256 comment

[noreply at github.com]

  Branch: refs/heads/master
  Home:   https://github.com/parrot/parrot

  Commit: e87d3d6cb3e21d1bc98412bb99724be4cb51f9ba
      https://github.com/parrot/parrot/commit/e87d3d6cb3e21d1bc98412bb99724be4cb51f9ba
  Author: Bruce Gray <bruce.gray at acm.org>
  Date:   2011-07-05 (Tue, 05 Jul 2011)

  Changed paths:
    M runtime/parrot/library/Digest/sha256.pir

  Log Message:
  -----------
  Fix typo in sha256 comment