doc update
doc update

THEONE10211024/android-selector-chapek,hgl888/android-selector-chapek,JackWong025/android-selector-chapek,djsolar/android-selector-chapek,generalzou/android-selector-chapek,lbrant/android-selector-chapek,liwangdong/android-selector-chapek,inmite/android-selector-chapek