Docs tweak

Author: mbabker

docs/client-usage.md

@@ -108,9 +108,6 @@ TwilioClient::twilio();
 
 ## HTTP Client
 
-This package attempts to create an appropriate `Twilio\Http\Client` for the SDK based on the packages available in your application, using the following preferences:
-
-- If Guzzle is available, a client using [Laravel's HTTP client](https://laravel.com/docs/http-client) is used
-- If Guzzle is not available, the Twilio SDK's Curl client is used
+This package provides an implementation of the `Twilio\Http\Client` using [Laravel's HTTP client](https://laravel.com/docs/http-client) to handle the underlying API requests.
 
 If you need to customize the HTTP client used by default in your application, you can extend the `Twilio\Http\Client` service this package creates to use your own HTTP client.