comment tag (#505)

configs/ann/README.md

configs/apcnet/README.md

configs/ccnet/README.md

configs/cgnet/README.md

configs/danet/README.md

configs/deeplabv3/README.md

configs/deeplabv3plus/README.md

configs/dmnet/README.md

configs/dnlnet/README.md

configs/emanet/README.md

configs/encnet/README.md

configs/fastscnn/README.md

configs/fcn/README.md

configs/fp16/README.md

configs/gcnet/README.md

configs/hrnet/README.md

configs/mobilenet_v2/README.md

configs/mobilenet_v3/README.md

configs/nonlocal_net/README.md

configs/ocrnet/README.md