[DOCS] add a solution to installation error because of the old submodule (#384)
[DOCS] add a solution to installation error because of the old submodule (#384)

* [DOCS] add a solution to installation error

* Fix the command for updating submodules

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