nixos/doc: Fix outdated references in the NixOS manual

[OluchiTheAnalyst]

Fixed outdated references in the NixOS Manual

The previous manual contained outdated references to 'make' and incorrect shell prompts.
This commit updates the formatting to improve readability and ensure accuracy.

Fixes:
Fixed outdated references from make to devmode, corrected shell prompts from nix-shell$ to [nix-shell:~]$

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[OluchiTheAnalyst]

hello @fricklerhandwerk please could you review this?

[drupol]

Hello!

Congratulations for your first PR !

I added a minor comment, also, make sure to format the PR title according to the user contributor guide, the commit messages should also be reworked accordingly.

[drupol]

The commit log messages of your commits are not really formatted correctly and must be updated. Have you checked the contributing guide? Have a look at other PR to get some inspiration. Thanks.

[OluchiTheAnalyst]

Hi @drupol I have gone through the commit convention. when you say "commits are not really formatted" do you mean i should remove whitespaces?

[fricklerhandwerk]

This seems to be an editing artifact that needs to go away.

[OluchiTheAnalyst]

@fricklerhandwerk Fixed! I removed the unintended submodule change. Thanks for catching that! Let me know if anything else needs adjustment

[OluchiTheAnalyst]

Hi @drupol I have gone through the commit convention. when you say "commits are not really formatted" do you mean i should remove whitespaces?

Thanks for the feedback @drupol I've updated the commit messages to follow the correct format. Please have a look at it and let me know if any further adjustments are needed.

[drupol]

Have a look at this PR to get some inspiration: #392831

[OluchiTheAnalyst]

Have a look at this PR to get some inspiration: #392831

Hi @drupol fixed the commit log message, please have a look, thank you!

[drupol]

LGTM, thanks !