t / t5100 / info0011on commit check-ref-format doc: de-emphasize the implementation detail of a ref (a0a7e9e)
   1Author: A U Thor
   2Email: a.u.thor@example.com
   3Subject: Xyzzy
   4Date: Fri, 8 Aug 2008 13:08:37 +0200 (CEST)
   5