public function documentationCommand($packageKey)
{
$this->validatePackageKey($packageKey);
if (!$this->packageManager->isPackageAvailable($packageKey)) {
$this->outputLine('Package "%s" is not available.', array($packageKey));
exit(2);
}
$generatedFiles = $this->generatorService->generateDocumentation($packageKey);
$this->outputLine(implode(PHP_EOL, $generatedFiles));
}