[LTP] [PATCH v3] Correctly check setitimer params in setitimer01

[Petr Vorel]

Hi all,

...
> > +       tst_res(TINFO, "clock resolution: %luns, "


> I would use "low-resolution" for this output, but
> someone merge patch can help modify it.
I fixed that + slightly reword docs and commit message before merge
(using imperative mood).

Thanks a lot to all!

Kind regards,
Petr