[Docs]: Remove signature params for Laravel integration

[pxlrbt]

Hey,

I know that the example code doesn't show any usage combined with signed routes (maybe that's worth an example, too?), but since it's not a big change, I think it might make sense to remove the signature params from the request in the example.

I used that code, made the route signed later on and DoS my server with cache images 😅 Just want to prevent others from making the same mistake.

Cheers,
Dennis