How do I fix a typo in a git commit comment?

[Hal Murray]

The 674 should be 474.

commit c8c888f8f2ef295c0ea5f854127069b3812e4c09
Author: Hal Murray <murray at shuksan.example.com>
Date:   Fri Mar 23 01:11:17 2018 -0700

    Add logging of year(s) on large clock steps.  Issue #674


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