Always getting "No HTTP method given, invalid API blueprint."

I'm always getting the following error when trying to generate docs:

```
[RuntimeException]
No HTTP method given, invalid API blueprint.
```

This is the command I run:

```
php artisan api:docs --output-file docs.md
```

And this is the controller that I have

``` php
manager = $manager;

parent::__construct($request, $app);
}

/**
* Login method
*
* @return \Dingo\Api\Http\Response
*
* @Get("/")
*/
public function login()
{
$credentials = $this->request->only('email', 'password');

$token = $this->manager->login($credentials);
$response = $this->response->array($token);

return $response;
}

/**
* Register method
*
* @return \Dingo\Api\Http\Response
*
* @Get("/")
*/
public function register()
{
$credentials = $this->request->only('email', 'password', 'name');

$user = $this->manager->register($credentials);
$location = route('users.me');
$response = $this->response
->item($user, new UserTransformer, [
'key' => 'users',
])
->setStatusCode(201)
->withHeader('Location', $location);

return $response;
}
}
```

I have some other controllers that are not documented.

Reproduce the failure with `php artisan api:docs --output-file docs.md` and inspect the annotations shown in AuthController, especially the documented methods. Determine why the generator reports that no HTTP method was given, then verify that documentation generation completes and includes the intended controller endpoints.

Written by the indexing model from the issue text.