chore(git-node): Add make lint-md reminder

[ruyadorno]

After two consecutive releases in which I mistakenly pushed a broken release commit to main, I'm convinced that the process needs improvement.

This PR proposes to add a reminder to git node release promote to lint markdown files prior to pushing branches to upstream remote.

Refs: https://github.com/nodejs/node/commit/a344300bfa146fce9d1f20a71b073263a4720eab Refs: https://github.com/nodejs/node/pull/56508