Update doc to 1.6.
Update doc to 1.6.

cbeust/jcommander,selliera/jcommander,madrob/jcommander,selliera/jcommander,cbeust/jcommander,selliera/jcommander,VikingDen/jcommander,TKlerx/jcommander,winndows/jcommander,cbeust/jcommander,madrob/jcommander