doc: update release notes for hns3 driver
doc: update release notes for hns3 driver

Add release notes for Hisilicon hns3 PMD driver.

Signed-off-by: Wei Hu (Xavier) <0e556b9333cda22a2a365b940422aea48fdffc88@huawei.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk