It should include the entire URL to the pull request, as these often act as code reviews for the code.
For example: `https://github.com/freebsd/freebsd-src/pull/745`
+|`Co-authored-by:`
+|The name and email address of an additional author of the commit.
+GitHub has a detailed description of the Co-authored-by trailer at https://docs.github.com/en/pull-requests/committing-changes-to-your-project/creating-and-editing-commits/creating-a-commit-with-multiple-authors.
+
|`Signed-off-by:`
|ID certifies compliance with https://developercertificate.org/