Apple designed its new AirPods to be pretty easy to set up and use, but one thing that’s clearly missing is the ability to change the volume using hardware controls without reaching for your iPhone. Fortunately, if you regularly use AirPods without an iPhone or Apple Watch within reach, you might find it handy to know that you can actually change your iPhone’s volume using Siri voice commands. Simply tap on the AirPods to activate Siri,…