Add explicit mention to not call some APIs in callbacks.

miniaudio.h

@@ -2788,6 +2788,8 @@ Uninitializes a device.
 This will explicitly stop the device. You do not need to call ma_device_stop() beforehand, but it's
 harmless if you do.
 
+Do not call this in any callback.
+
 Return Value:
   MA_SUCCESS if successful; any other error code otherwise.
 
@@ -2816,6 +2818,8 @@ to be done _before_ the device begins playback.
 This API waits until the backend device has been started for real by the worker thread. It also
 waits on a mutex for thread-safety.
 
+Do not call this in any callback.
+
 Return Value:
   MA_SUCCESS if successful; any other error code otherwise.
 
@@ -2837,6 +2841,8 @@ the resuming it with ma_device_start() (which you might do when your program los
 in a situation where those samples are never output to the speakers or received from the microphone
 which can in turn result in de-syncs.
 
+Do not call this in any callback.
+
 Return Value:
   MA_SUCCESS if successful; any other error code otherwise.