nixos/doc/manual: refine extraLayouts, add warnings an test commands #119952
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Motivation for this change
i have wasted quite some times, and had several questions after i tried to use this feature.
note that i put the closing xml tags are at the end of the line at one place to avoid adding a superfluous space in the output.
Things done
sandbox
innix.conf
on non-NixOS linux)nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
./result/bin/
)nix path-info -S
before and after)