[PATCH xrandr] Document --brightness option in --help message

[Mikhail Gusarov]

Twas brillig at 22:33:31 25.02.2012 UTC+01 when dottedmag at dottedmag.net did gyre and gimble:

 MG> This option is introduced more than two years ago, mentioned in
 MG> manpage, but not in the --help message.

Scratch this. Another mail with s-o-b is on the way.

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