Documentation updates.
Documentation updates.

not-only-code/PreloadJS,andrew168/PreloadJS,Teino1978-Corp/Teino1978-Corp-PreloadJS,sokeroner/PreloadJS,ebabel-eu/PreloadJS,sokeroner/PreloadJS,andrew168/PreloadJS,dmnsgn/PreloadJS,tehvgg/PreloadJS,cnbin/PreloadJS,cnbin/PreloadJS,Teino1978-Corp/Teino1978-Corp-PreloadJS,CreateJS/PreloadJS,CreateJS/PreloadJS,SpringRoll/PreloadJS,SpringRoll/PreloadJS,tehvgg/PreloadJS