Automated documentation update (devcontainers#799)

Automated documentation update [skip ci]

Co-authored-by: github-actions <github-actions@github.com>

Author: devcontainers-bot

src/nix/README.md

@@ -18,6 +18,7 @@ Installs the Nix package manager and optionally a set of packages.
 | version | Version of Nix to install. | string | latest |
 | multiUser | Perform a multi-user install (instead of single user) | boolean | true |
 | packages | Optional comma separated list of Nix packages to install in profile. | string | - |
+| useAttributePath | Enable this option to use exact attribute path of the package in the Nixpkgs repository, aligning with the nix-env -iA command. | boolean | false |
 | flakeUri | Optional URI to a Nix Flake to install in profile. | string | - |
 | extraNixConfig | Optional comma separated list of extra lines to add to /etc/nix/nix.conf. | string | - |