https://git-scm.com/docs/git-interpret-trailers says:
When reading trailers, there can be no whitespace before or inside the <key>, but any number of regular space and tab characters are allowed between the <key> and the separator. There can be whitespaces before, inside or after the <value>. The <value> may be split over multiple lines with each subsequent line starting with at least one whitespace, like the "folding" in RFC 822. Formatting these Git trailers correctly ensures they can be used with git-interpret-trailers and found with a simple 'git log --grep' query, without having to match a mix of correct and incorrect forms using a regex. This is especially important for Signed-off-by: because the DCO sign-off is legally significant and it makes things harder to check if you use the wrong form of the tag. Please ensure that all trailers in Git commit messages are hyphenated, e.g. "Co-authored-by:" not "Co-authored by:", and especially not "Signed off by:"
