[Doc] TVM_REGISTER_API -> TVM_REGISTER_GLOBAL (#4768)
[Doc] TVM_REGISTER_API -> TVM_REGISTER_GLOBAL (#4768)


tqchen/tvm,Laurawly/tvm-1,Laurawly/tvm-1,dmlc/tvm,tqchen/tvm,tqchen/tvm,Laurawly/tvm-1,tqchen/tvm,tqchen/tvm,sxjscience/tvm,sxjscience/tvm,sxjscience/tvm,dmlc/tvm,tqchen/tvm,dmlc/tvm,sxjscience/tvm,Laurawly/tvm-1,Laurawly/tvm-1,tqchen/tvm,Laurawly/tvm-1,dmlc/tvm,tqchen/tvm,sxjscience/tvm,Laurawly/tvm-1,dmlc/tvm,Laurawly/tvm-1,dmlc/tvm,sxjscience/tvm,dmlc/tvm,tqchen/tvm,dmlc/tvm,Laurawly/tvm-1,tqchen/tvm,sxjscience/tvm,sxjscience/tvm,dmlc/tvm,Laurawly/tvm-1,sxjscience/tvm