lib.trivial: add examples for importJSON and importTOML

[TheCodedProf]

Description of changes

Added examples for both lib.trivial.importJSON and lib.trivial.importTOML

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/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 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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[infinisil]

Check out e.g.

nixpkgs/lib/trivial.nix

Lines 95 to 126 in a1bed62

	# Examples
	:::{.example}
	## `lib.trivial.pipe` usage example
	```nix
	pipe 2 [
	(x: x + 2) # 2 + 2 = 4
	(x: x * 2) # 4 * 2 = 8
	]
	=> 8
	# ideal to do text transformations
	pipe [ "a/b" "a/c" ] [
	# create the cp command
	(map (file: ''cp "${src}/${file}" $out\n''))
	# concatenate all commands into one string
	lib.concatStrings
	# make that string into a nix derivation
	(pkgs.runCommand "copy-to-out" {})
	]
	=> <drv which copies all files to $out>
	The output type of each function has to be the input type
	of the next function, and the last function returns the
	final value.
	```
	:::

for the conventional example syntax :)

[nixos-discourse]

This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/prs-ready-for-review/3032/4082

[infinisil]

Pushed a very minor change, looking good now, thanks!