Update trouble shooting

[ZwwWayne]

Resolves #3379

[codecov]

Codecov Report

Merging #3994 into master will decrease coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3994      +/-   ##
==========================================
- Coverage   62.23%   62.11%   -0.13%     
==========================================
  Files         221      221              
  Lines       16321    16321              
  Branches     2762     2762              
==========================================
- Hits        10158    10137      -21     
- Misses       5669     5690      +21     
  Partials      494      494              

Flag	Coverage Δ
#unittests	62.11% <ø> (-0.13%)	⬇️

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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%)	⬇️
mmdet/models/detectors/cornernet.py	94.87% <0.00%> (-5.13%)	⬇️
mmdet/models/dense_heads/corner_head.py	74.86% <0.00%> (-1.92%)	⬇️
mmdet/models/roi_heads/test_mixins.py	59.82% <0.00%> (+9.40%)	⬆️

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