[Improvement] Add links to download Kinetics400 validation

[kennymckormick]

No description provided.

[codecov]

Codecov Report

Merging #920 (3c88ed4) into master (e9b7009) will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #920      +/-   ##
==========================================
- Coverage   83.71%   83.58%   -0.14%     
==========================================
  Files         131      132       +1     
  Lines        9870     9966      +96     
  Branches     1699     1718      +19     
==========================================
+ Hits         8263     8330      +67     
- Misses       1197     1218      +21     
- Partials      410      418       +8     

Flag	Coverage Δ
unittests	83.58% <ø> (-0.14%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmaction/models/recognizers/recognizer3d.py	81.69% <0.00%> (-14.61%)	⬇️
mmaction/models/recognizers/recognizer2d.py	84.94% <0.00%> (-5.30%)	⬇️
...maction/models/roi_extractors/single_straight3d.py	74.24% <0.00%> (-3.35%)	⬇️
mmaction/core/evaluation/accuracy.py	92.27% <0.00%> (-0.91%)	⬇️
mmaction/models/recognizers/base.py	66.90% <0.00%> (-0.77%)	⬇️
mmaction/datasets/ava_dataset.py	90.60% <0.00%> (ø)
mmaction/models/heads/__init__.py	100.00% <0.00%> (ø)
mmaction/models/heads/roi_head.py	75.00% <0.00%> (ø)
mmaction/models/backbones/resnet3d.py	90.74% <0.00%> (ø)
mmaction/datasets/pipelines/augmentations.py	92.98% <0.00%> (ø)
... and 2 more

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