Add detection and segmentation models to doc folder

[fmassa]

No description provided.

[codecov-io]

Codecov Report

Merging #933 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #933      +/-   ##
==========================================
- Coverage   60.32%   60.26%   -0.06%     
==========================================
  Files          63       63              
  Lines        5001     5001              
  Branches      745      745              
==========================================
- Hits         3017     3014       -3     
- Misses       1781     1784       +3     
  Partials      203      203

Impacted Files	Coverage Δ
torchvision/models/detection/faster_rcnn.py	74.39% <ø> (ø)	⬆️
torchvision/models/detection/mask_rcnn.py	81.03% <ø> (ø)	⬆️
torchvision/models/detection/keypoint_rcnn.py	81.81% <ø> (ø)	⬆️
torchvision/transforms/transforms.py	81.89% <0%> (-0.65%)	⬇️
torchvision/datasets/imagenet.py	21.55% <0%> (ø)	⬆️

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