prevent generation of docs for tests
prevent generation of docs for tests

Updated the exclusion list in order to prevent Sphinx from generating docs for test directories
Agent007/deepchem,miaecle/deepchem,miaecle/deepchem,deepchem/deepchem,lilleswing/deepchem,Agent007/deepchem,lilleswing/deepchem,ktaneishi/deepchem,Agent007/deepchem,ktaneishi/deepchem,ktaneishi/deepchem,peastman/deepchem,peastman/deepchem,deepchem/deepchem,lilleswing/deepchem,miaecle/deepchem