doc: make openssl commit messages be valid

The current commit message is wrapped at 80 columns, but commit message
descriptions should wrap at 72, so the maintainer has to fix the
message up instead of just copying it in. They might not notice that
requirement, in which case it has to be fixed during landing because
`git node land` notices. To prevent that, make the message template
wrap before 72 to keep the landing process as simple as possible.

PR-URL: https://github.com/nodejs/node/pull/32602


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>