audio: the Bluetooth question stacks its buttons, and no longer says the music goes over USB

gearslip/src/main/res/values/strings.xml

@@ -415,7 +415,7 @@
     <string name="audio_open_settings">Open app settings</string>
 
     <!--  -->
-    <string name="audio_bt_body">Android treats music sent over USB like sharing your screen, so it asks every drive. Over Bluetooth it never asks. You can change this later in Settings.</string>
+    <string name="audio_bt_body">Android treats the music Gearslip sends to the car like sharing your screen, so it asks every drive, over a cable or wireless. Over Bluetooth it never asks. You can change this later in Settings.</string>
     <string name="audio_keep_usb">Or keep USB and stop the question for good: plug the phone into a computer with USB debugging on, and run this once.</string>
     <string name="audio_mic_body">Android lets an app send other apps\' sound to the car only if it has the microphone permission. It\'s turned off for Gearslip, so music plays on the phone. Turn it on under Permissions, then Microphone.</string>