Documentation: add the device isolation feature sysfs nodes for uacce

Update documentation describing sysfs node that could help to
configure hardware error threshold for users in the user space. And
describing sysfs node that could read the device isolated state.

Signed-off-by: Kai Ye <yekai13@huawei.com>
Link: https://lore.kernel.org/r/20221119074817.12063-3-yekai13@huawei.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>