Fixes to Stage.nextStage docs.
Fixes to Stage.nextStage docs.

Signed-off-by: Grant Skinner <59bd0a3ff43b32849b319e645d4798d8a5d1e889@gskinner.com>

SpringRoll/EaselJS,SpringRoll/EaselJS,mientjan/EaselTS,markknol/EaselTS,createjs-components/easeljs,mientjan/EaselTS,mientjan/weasel,markknol/EaselTS,markknol/EaselTS,mientjan/weasel