[DOC] Update ssd doc to avoid confusion. (#3677)
[DOC] Update ssd doc to avoid confusion. (#3677)

* intel graphics conv2d bugs fixed for inception_v3

* intel conv2d api updated, nn input size 4 condition added

* review addressed

* move conv_tags to attributes

* ssd doc updated

* address comment

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