update usage doc
update usage doc

pannag/cs294,danieltsai0/CS294-112-HW3,berkeleydeeprlcourse/homework,dmitrinesterenko/cs294,heyinUCB/CS294,danieltsai0/CS294-112-HW3,dmitrinesterenko/cs294,mmt/deeprl22,wryoung412/CS294_Deep_RL,pashadude/TensorflowReinforcementLearning,pannag/cs294,heyinUCB/CS294,pashadude/TensorflowReinforcementLearning,berkeleydeeprlcourse/homework,wryoung412/CS294_Deep_RL,mmt/deeprl22