Improve whereBelongsTo functionality

[MohammadZarifiyan]

The whereBelongsTo method should be changed to pass the relation ID (e.g. 112) as its first parameter and the relation name as its second parameter.

As a result, the following code should work:

use App\Models\Post;

Post::whereBelongsTo(112, 'category')->get();

[MohammadZarifiyan]

@taylorotwell