Docs: Fix a dangling ref.
During the initial review, we missed that I wrote `detached head`
in the link to
instead of `detached`. This corrects the link.
@@ -135,7 +135,7 @@ branches.
[^2]: If you're wondering why we prefer clean commits in this project, see
e.g.[this blog post][stacked]
-[detached head]: https://git-scm.com/docs/git-checkout#_detached_head
+[detached]: https://git-scm.com/docs/git-checkout#_detached_head
[gh]: https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent
