Update Docs for tuist xcodebuild and fastlane

Why is this needed?

tuist xcodebuild command documentation only shows direct xcodebuild runs. However, many apps use Fastlane. I fixed the command to make it usable with Fastlane here #8170 . Could you update the documentation to include Fastlane examples?

Steps to address the need

lane :build_only do |options|
    scan(
      workspace:"./App.xcworkspace",
      scheme: "App",
      build_for_testing: true,
      code_coverage: true,
      result_bundle: true,
      xcodebuild_formatter: "xcbeautify",
      xcodebuild_command: "tuist xcodebuild"
    )
  end

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