Update multi-gpu discussion for device_buffer and device_vector dtors #1524
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Description
Since #1370, the dtor for device_buffer ensures that the correct device is active when the deallocation occurs. We therefore update the example to discuss this. Since device_vector still requires the user to manage the active device correctly by hand, call this out explicitly in the documentation.
device_buffer
,device_vector
and friends #1523Checklist