[PATCH] gpudev: improve CPU unmap description

[Thomas Monjalon]

22/02/2022 00:07, eagostini at nvidia.com:
> From: Elena Agostini <eagostini at nvidia.com>
> 
> Minor update in rte_gpu_mem_cpu_unmap header
> documentation.
> 
> Signed-off-by: Elena Agostini <eagostini at nvidia.com>

Applied, thanks.