Fix docs typo

[simonJJJ]

cudatoolkit==10.1 -> cudatoolkit=10.1

[codecov]

Codecov Report

Merging #4105 (b378cc9) into master (72a9146) will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4105      +/-   ##
==========================================
- Coverage   61.91%   61.78%   -0.14%     
==========================================
  Files         225      225              
  Lines       16641    16641              
  Branches     2814     2814              
==========================================
- Hits        10304    10281      -23     
- Misses       5838     5862      +24     
+ Partials      499      498       -1     

Flag	Coverage Δ
unittests	61.74% <ø> (-0.14%)	⬇️

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Impacted Files	Coverage Δ
mmdet/models/roi_heads/mask_scoring_roi_head.py	55.35% <0.00%> (-32.15%)	⬇️
mmdet/models/roi_heads/mask_heads/maskiou_head.py	94.62% <0.00%> (-5.38%)	⬇️

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