docs: update Steam instructions to use steam-run-native package

pkgs.steam-run-native is defined as exactly the expression that
these instructions tell you to write, so the instruction is no
longer necessary since we can just tell you to use that.

Changed files
+1 -10
doc
builders
packages
+1 -10
doc/builders/packages/steam.section.md
···
## steam-run {#sec-steam-run}
-
The FHS-compatible chroot used for steam can also be used to run other linux games that expect a FHS environment. To do it, add
-
-
```nix
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pkgs.steam.override ({
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nativeOnly = true;
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newStdcpp = true;
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}).run
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```
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to your configuration, rebuild, and run the game with
```
steam-run ./foo
···
## steam-run {#sec-steam-run}
+
The FHS-compatible chroot used for Steam can also be used to run other Linux games that expect a FHS environment. To use it, install the `steam-run-native` package and run the game with
```
steam-run ./foo