[5.5] Fix for route facade phpdoc to avoid Phan and PHPStorm errors

[websmurf]

We are currently in the process of integrating Phan (https://github.com/phan/phan) into our projects and both PHPstorm and Phan are complaining about the Route::middelware annotation:

src/Services/Api/Routes/Authentication.php:18 PhanParamTooFew Call with 1 arg(s) to \Illuminate\Support\Facades\Route::group() which requires 2 arg(s) defined at vendor/laravel/framework/src/Illuminate/Support/Facades/Route.php:25
src/Services/Api/Routes/Authentication.php:26 PhanParamTooFew Call with 1 arg(s) to \Illuminate\Support\Facades\Route::group() which requires 2 arg(s) defined at vendor/laravel/framework/src/Illuminate/Support/Facades/Route.php:25

I've narrowed it down to a fix that was applied on the 5.6 branch, this is a port of that fix to resolve this issue in the LTS version as well