minor issues with 1.8-RC1 NEWS

[Mike Kupfer]

Hi, I'm starting to look at 1.8-RC1, and I noticed a typo and an
omission in the NEWS file.

Typo: In the first paragraph, "Long-time MH and nmh uses":
s/uses/users/.

Omission: It looks like mhparam no longer supports "libdir".  I don't
object to the change, since the NEWS for nmh 1.7 noted that it would go
away at some point.  But it does seem worth noting in the NEWS file for
1.8.

Thanks for your work on nmh.

best regards,
mike