[Docs] Fix docstring for 3d flate

[dreamerlin]

No description provided.

[codecov]

Codecov Report

Merging #925 (07efd01) into master (f8b595a) will increase coverage by 0.09%.
The diff coverage is 87.50%.

❗ Current head 07efd01 differs from pull request most recent head e1e6147. Consider uploading reports for the commit e1e6147 to get more accurate results

@@            Coverage Diff             @@
##           master     #925      +/-   ##
==========================================
+ Coverage   83.57%   83.67%   +0.09%     
==========================================
  Files         132      132              
  Lines        9966     9983      +17     
  Branches     1718     1722       +4     
==========================================
+ Hits         8329     8353      +24     
+ Misses       1218     1212       -6     
+ Partials      419      418       -1     

Flag	Coverage Δ
unittests	83.67% <87.50%> (+0.09%)	⬆️

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

Impacted Files	Coverage Δ
mmaction/models/backbones/resnet3d.py	90.74% <ø> (ø)
mmaction/models/backbones/resnet3d_csn.py	97.36% <ø> (ø)
mmaction/models/backbones/resnet3d_slowfast.py	82.65% <ø> (ø)
mmaction/models/recognizers/base.py	68.00% <75.00%> (+1.09%)	⬆️
mmaction/apis/inference.py	89.85% <100.00%> (+8.90%)	⬆️
mmaction/core/__init__.py	100.00% <100.00%> (ø)
mmaction/core/scheduler/__init__.py	100.00% <100.00%> (ø)
mmaction/core/scheduler/lr_updater.py	96.55% <100.00%> (ø)
mmaction/models/recognizers/recognizer2d.py	84.94% <100.00%> (ø)
mmaction/core/evaluation/accuracy.py	92.27% <0.00%> (-0.91%)	⬇️
... and 3 more

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