doc/manual/src/installation/upgrading.md

[andrewbaxter]

Describe the bug

Upgrading is missing instructions for upgrading with nix profile.

Expected behavior

It's not clear how to do this.

I randomly tried

$ nix profile install nixpkgs#nixpkgs.cacert
error: flake 'flake:nixpkgs' does not provide attribute 'packages.x86_64-linux.nixpkgs.cacert', 'legacyPackages.x86_64-linux.nixpkgs.cacert' or 'nixpkgs.cacert'

but this doesn't work for instance.

nix-env --version output

nix-env (Nix) 2.11.1

Additional context

Priorities

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