remove Device.use() from user's guide
@@ -66,15 +66,7 @@ In such a case, the following code would create an array ``x_on_gpu0`` on GPU 0.
>>> x_on_gpu0 = cp.array([1, 2, 3, 4, 5])
-The current device can be changed using :class:`cupy.cuda.Device.use()` as follows:
-
-.. doctest::
-
- >>> x_on_gpu0 = cp.array([1, 2, 3, 4, 5])
- >>> cp.cuda.Device(1).use()
- >>> x_on_gpu1 = cp.array([1, 2, 3, 4, 5])
-
-To temporarily switch to another GPU device, use ``with`` context manager:
+To switch to another GPU device, use ``with`` context manager:
.. doctest::
