fix doc dir name mismatch
fix doc dir name mismatch

zhangxiaoli73/BigDL,wzhongyuan/BigDL,qiuxin2012/BigDL,yiheng/BigDL,jenniew/BigDL,yiheng/BigDL,jenniew/BigDL,luchy0120/BigDL,yiheng/BigDL,luchy0120/BigDL,qiuxin2012/BigDL,i8run/BigDL-1,i8run/BigDL-1,qiuxin2012/BigDL,i8run/BigDL-1,luchy0120/BigDL,wzhongyuan/BigDL,zhangxiaoli73/BigDL,jenniew/BigDL,wzhongyuan/BigDL,zhangxiaoli73/BigDL