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Improve documentation around upgrading nix (#9679)

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* Improve documentation around upgrading nix, add replacing nix channel with new one

Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
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35
doc/manual/src/installation/upgrading.md
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# Upgrading Nix
> **Note**
>
> These upgrade instructions apply for regular Linux distributions where Nix was installed following the [installation instructions in this manual](./index.md).
First, find the name of the current [channel](@docroot@/command-ref/nix-channel.md) through which Nix is distributed:
```console
$ nix-channel --list
```
By default this should return an entry for Nixpkgs:
```console
nixpkgs https://nixos.org/channels/nixpkgs-23.05
```
Check which Nix version will be installed:
```console
$ nix-shell -p nix -I nixpkgs=channel:nixpkgs-23.11 --run "nix --version"
nix (Nix) 2.18.1
```
> **Warning**
>
> Writing to the [local store](@docroot@/store/types/local-store.md) with a newer version of Nix, for example by building derivations with `nix-build` or `nix-store --realise`, may change the database schema!
> Reverting to an older version of Nix may therefore require purging the store database before it can be used.
Update the channel entry:
```console
$ nix-channel --remove nixpkgs
$ nix-channel --add https://nixos.org/channels/nixpkgs-23.11 nixpkgs
```
Multi-user Nix users on macOS can upgrade Nix by running: `sudo -i sh -c
'nix-channel --update &&
nix-env --install --attr nixpkgs.nix &&