CoC: Update word-wrapping to match upstream

CoC: Update word-wrapping to match upstream

When the CoC document was added in 5cdf2301d4a (add a Code of Conduct
document, 2019-09-24) it was added from some 1.4 version of the
document whose word wrapping doesn't match what's currently at [1],
which matches content/version/1/4/code-of-conduct.md in the CoC
repository[2].

Let's update our version to match that, to make reading subsequent
diffs easier. There are no non-whitespace changes here.

1. https://www.contributor-covenant.org/version/1/4/code-of-conduct/
2. https://github.com/ContributorCovenant/contributor_covenant

Signed-off-by: Ævar Arnfjörð Bjarmason <redacted>
Signed-off-by: Junio C Hamano <redacted>