The "zone_capacity=%umb" option is no longer used. The effective option
is now "zone_capacity_mb=%u", so update the documentation accordingly.
Signed-off-by: Yongpeng Yang <yangyongpeng@xiaomi.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>