Remove empty new line from docs

Author: José Valim

lib/gen_stage/dispatchers/broadcast_dispatcher.ex

@@ -2,7 +2,7 @@ defmodule GenStage.BroadcastDispatcher do
   @moduledoc """
   A dispatcher that accumulates demand from all consumers
   before broadcasting events to all of them.
-  
+
   This dispatcher guarantees that events are dispatched to all
   consumers without exceeding the demand of any given consumer.