Fix error in building SDK from doc build script.
Fix error in building SDK from doc build script.

caskdata/cdap,mpouttuclarke/cdap,chtyim/cdap,anthcp/cdap,hsaputra/cdap,caskdata/cdap,hsaputra/cdap,mpouttuclarke/cdap,hsaputra/cdap,chtyim/cdap,mpouttuclarke/cdap,chtyim/cdap,hsaputra/cdap,caskdata/cdap,anthcp/cdap,mpouttuclarke/cdap,caskdata/cdap,chtyim/cdap,anthcp/cdap,anthcp/cdap,chtyim/cdap,chtyim/cdap,anthcp/cdap,caskdata/cdap,caskdata/cdap,hsaputra/cdap,mpouttuclarke/cdap