fix typos and comments (#318)
fix typos and comments (#318)


huanzhang12/LightGBM,olofer/LightGBM,wxchan/LightGBM,fstonezst/LightGBM,microsoft/LightGBM,fstonezst/LightGBM,sightmachine/LightGBM,fstonezst/LightGBM,Allardvm/LightGBM,sightmachine/LightGBM,henry0312/LightGBM,henry0312/LightGBM,huanzhang12/LightGBM,wxchan/LightGBM,sightmachine/LightGBM,huanzhang12/LightGBM,microsoft/LightGBM,henry0312/LightGBM,Allardvm/LightGBM,wxchan/LightGBM,huanzhang12/lightgbm-gpu,huanzhang12/lightgbm-gpu,olofer/LightGBM,Laurae2/LightGBM,wxchan/LightGBM,fstonezst/LightGBM,henry0312/LightGBM,huanzhang12/lightgbm-gpu,olofer/LightGBM,sightmachine/LightGBM,huanzhang12/LightGBM,huanzhang12/lightgbm-gpu,microsoft/LightGBM,olofer/LightGBM,Laurae2/LightGBM,huanzhang12/lightgbm-gpu,Laurae2/LightGBM,Allardvm/LightGBM,microsoft/LightGBM,microsoft/LightGBM,huanzhang12/LightGBM,henry0312/LightGBM,Allardvm/LightGBM,Laurae2/LightGBM,Laurae2/LightGBM,Allardvm/LightGBM,olofer/LightGBM,fstonezst/LightGBM,wxchan/LightGBM