Use FQCN to avoid confusion

Author: sagikazarmark

src/HttpClient.php

@@ -21,8 +21,8 @@ interface HttpClient
      *
      * @return ResponseInterface
      *
-     * @throws Exception  If an error happens during processing the request.
-     * @throws \Exception If processing the request is impossible (eg. bad configuration).
+     * @throws \Http\Client\Exception  If an error happens during processing the request.
+     * @throws \Exception              If processing the request is impossible (eg. bad configuration).
      */
     public function sendRequest(RequestInterface $request);
 }