doc/manual: Fix some broken fragments (backport #11629)

[mergify]

Motivation

Fix 🔧

• Bring closer doc: Check link fragments with lychee #11306

Context

Priorities and Process

Add 👍 to pull requests you find important.

The Nix maintainer team uses a GitHub project board to schedule and track reviews.

---

This is an automatic backport of pull request #11629 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 071ddbe has failed:

On branch mergify/bp/2.24-maintenance/pr-11629
Your branch is up to date with 'origin/2.24-maintenance'.

You are currently cherry-picking commit 071ddbed5.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   doc/manual/src/command-ref/nix-env.md
	modified:   doc/manual/src/language/derivations.md
	modified:   doc/manual/src/release-notes/rl-2.23.md
	modified:   src/libcmd/installables.cc
	modified:   src/nix/shell.md

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   doc/manual/src/language/operators.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally