[PATCH] docs: sysfs-block: document hidden sysfs entry

[Chaitanya Kulkarni]

On 3/3/23 00:43, Sagi Grimberg wrote:
> /sys/block/<disk>/hidden is undocumented. Document it.
>
> Signed-off-by: Sagi Grimberg <sagi at grimberg.me>
> ---
>   
Looks good.

Reviewed-by: Chaitanya Kulkarni <kch at nvidia.com>

-ck