man page: add offset unit info for offset= option

man page: add offset unit info for offset= option

Apply below commit to fio(1) man page.
82dbb8cb (HOWTO: add offset unit info for offset= option)

Certain sections/options of the man page are not in sync with HOWTO,
but this one was identical, thus the changes are the same as above.

--
On 06/27/2017 08:56 AM, Elliott, Robert (Persistent Memory) wrote:
>>  HOWTO | 8 +++++---
>>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> The manpage (fio.1) should be updated as well - that's more visible to users.
Agree, I usually catch that.

Signed-off-by: Tomohiro Kusumi <tkusumi@tuxera.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>