[MPlayer-DOCS] Misdocumented option -verbose

[Oded Shimon]

-verbose is totally misdocumented in the docs, it's described as simply an 
alias to '-v', its actual behavior is accepting a number, from 0 to 9, 
matching the different mp_msg levels (MSGL).

mplayer        => mplayer -verbose 0
mplayer -v     => mplayer -verbose 1
mplayer -v -v  => mplayer -verbose 2


and so on...

with msglevel patch i just sent to dev-eng, -verbose corresponds to 
'-msglevel all=', only +5 levels.

- ods15