man: correct typos, iff -> if

Op 27-03-18 om 20:23 schreef Larry Hynes:
> Funny, I did wonder if it might be a contraction, but I did find
> it odd that it's not mentioned or explained. I'll leave it be, if
> you all are happy enough to keep it 'as is', or can resubmit if you
> think it's warranted.

I think the simple fact that it came up here is evidence that this is
too jargony for a manual. Patch attached.

- M.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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