doc: nixos.md: Corrected to showcase module usage.

website/content/en/docs/setup/installation/operating-systems/nixos.md

@@ -8,22 +8,50 @@ weight: 6
 [NixOS] is a Linux distribution built on top of the Nix package manager. This
 page covers installing and managing Vector on NixOS.
 
-Nixpkgs has a [community maintained package][nixpkg-vector] for Vector. It can
-be installed on a NixOS system with the following snippet in
-`configuration.nix`:
+Nixpkgs has a [community maintained module][nixpkg-vector] for Vector.
+The options for which may be viewed on the [NixOS Search][nixos-search].
+
+This can be used to deploy and configure Vector on a NixOS system.
+For example, place into a system's `configuration.nix`:
 
 ```nix
-environment.systemPackages = [
-  pkgs.vector
-];
+services.vector = {
+  enable = true;
+  journaldAccess = true;
+  settings = builtins.fromTOML ''
+    [sources.journald]
+    type = "journald"
+    current_boot_only = true
+
+    [sources.vector_metrics]
+    type = "internal_metrics"
+
+    [sinks.loki]
+    type = "loki"
+    inputs = [ "journald" ]
+    endpoint = "https://loki.mycompany.com"
+
+    [sinks.loki.labels]
+    source = "journald"
+
+    [sinks.prometheus_exporter]
+    type = "prometheus_exporter"
+    inputs = [ "vector_metrics" ]
+    address = "[::]:9598"
+  '';
+};
 ```
 
+The module will allow validate that the Vector configuration is valid before
+enabling any changes.
+
 See also the [Nix] package page.
 
 ## Supported installers
 
 {{< supported-installers >}}
 
 [nixos]: https://www.nixos.org
-[nixpkg-vector]: https://github.com/NixOS/nixpkgs/tree/master/pkgs/tools/misc/vector
+[nixpkg-vector]: https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/services/logging/vector.nix
+[nixos-search]: https://search.nixos.org/options?query=services.vector
 [nix]: /docs/setup/installation/package-managers/nix