doc/extern: improve overlay filtering explanation

Co-authored-by: David Arnold <dar@xoe.solutions>
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Pacman99 2021-05-10 12:17:41 -07:00 committed by GitHub
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@ -13,7 +13,7 @@ flake.nix:
channels.nixos.overlays = [ inputs.agenix.overlay ];
}
```
These overlays will be automatically filtered by inspecting the `inputs` argument.
Upon exporting overlays, these overlays will be automatically filtered out by inspecting the `inputs` argument.
## Modules
There is a dedicated `nixos.hostDefaults.externalModules` argument for external