Package versions do not match across tutorials

[aynsof]

The guidance says that users should

Check that the desired packages are indeed available in the expected version as we did in the [previous tutorial](https://nix.dev/tutorials/first-steps/ad-hoc-shell-environments#check-package-version).

But the expected versions in the previous tutorial are different from the versions provided in this tutorial.

Previous tutorial:

[nix-shell:~/environment/nix] git --version
git version 2.38.3
[nix-shell:~/environment/nix] nvim --version | head -1
NVIM v0.8.1
[nix-shell:~/environment/nix] npm --version
8.19.2

This tutorial:

[nix-shell:~/environment/nix]$ git --version
git version 2.42.0
[nix-shell:~/environment/nix]$ nvim --version | head -1
NVIM v0.9.4
[nix-shell:~/environment/nix]$ npm --version
9.8.1

Either the versions should match, or this tutorial should specify the expected versions from the given branch.

[fricklerhandwerk]

Hah, indeed. That was bound to drift because nix-shell -p will use whatever version of nixpkgs-unstable at installation time, while the declarative shell tutorial specifies a channel branch. The instruction was really meant to generally make sure you got the thing you wanted. In any case, #901 removes that particular line because the tools in the proposed change are trivial.