Include MSCD edition in message

[anseljh]

message: (
        'Use standard English instead of "ab initio".' +
        ' See MSCD 13.376-13.377.'
      ),

I think this is an MSCD Third Edition citation, but the Fourth Edition is out now. Should probably clarify which edition is being cited.

[kemitchell]

Yes. I am in process of distilling the fourth edition, but it's slow going. Maybe you could send a PR with s/MSCD/MSCD 3e/g?

[anseljh]

I can do that.