[Nut-upsdev] APC regexp match example in newhidups.8

[Charles Lepple]

I was testing out newhidups with an APC UPS, and I noticed that I
needed '-x vendor=American.Power.*' instead of '-x vendor=APC.*' as
indicated in the man page.

Do other APC USB UPSes use 'APC' in the vendor string? Should we
sidestep any such problems and just go with the hex vendor ID for APC
examples?

This was tested with a snapshot from the development branch, but the
man page has '-x vendor=APC.*' in testing as well as 2.0.3-pre2.

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- Charles Lepple