DisplayObject doc tweak.
DisplayObject doc tweak.

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

zhengjiangbin/EaselJS,xushuwei202/EaselJS,thinkerchan/EaselJS,nbellowe/EaselJS,CreateJS/EaselJS,ebabel-eu/EaselJS,andrew168/EaselJS,felipegtx/EaselJS,ovcharik/EaselJS,julianromera/EaselJS,abouthiroppy/EaselJS,EricHodgins/EaselJS,CreateJS/EaselJS,Teino1978-Corp/https-github.com-Teino1978-Corp-EaselJS,rhildred/abacus,Teino1978-Corp/https-github.com-Teino1978-Corp-EaselJS,briesurrood/EaselJS,xushuwei202/EaselJS,gitzxon/EaselJS,exsodus3249/EaselJS,briesurrood/EaselJS,abouthiroppy/EaselJS,johnv315/EaselJS,ovcharik/EaselJS,SpringRoll/EaselJS,exsodus3249/EaselJS,speedlightconsulting/EaselJS,rhildred/abacus,kidaa/EaselJS,nbellowe/EaselJS,8823-scholar/EaselJS,SpringRoll/EaselJS,andrew168/EaselJS,ytiurin/EaselJS,bambalaus/EaselJS,speedlightconsulting/EaselJS,thinkerchan/EaselJS,julianromera/EaselJS,8823-scholar/EaselJS,ebabel-eu/EaselJS,felipegtx/EaselJS,gitzxon/EaselJS,bambalaus/EaselJS,ytiurin/EaselJS,legendvijay/EaselJS,kidaa/EaselJS,johnv315/EaselJS,EricHodgins/EaselJS,zhengjiangbin/EaselJS,legendvijay/EaselJS