lint markdown

[jin-s13]

Refer to mdformat

And this style guideline

fix #368

[codecov]

Codecov Report

Merging #379 (70df790) into master (74d3399) will increase coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #379      +/-   ##
==========================================
+ Coverage   81.45%   81.62%   +0.17%     
==========================================
  Files         116      116              
  Lines        7484     7555      +71     
  Branches     1208     1208              
==========================================
+ Hits         6096     6167      +71     
  Misses       1143     1143              
  Partials      245      245              

Flag	Coverage Δ
unittests	81.62% <ø> (+0.17%)	⬆️

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

Impacted Files	Coverage Δ
mmpose/models/backbones/resnet.py	100.00% <0.00%> (ø)
mmpose/models/backbones/base_backbone.py	100.00% <0.00%> (ø)
mmpose/models/losses/multi_loss_factory.py	100.00% <0.00%> (ø)
mmpose/datasets/datasets/mesh/mosh_dataset.py	100.00% <0.00%> (ø)
...keypoint_heads/bottom_up_higher_resolution_head.py	100.00% <0.00%> (ø)
mmpose/models/backbones/regnet.py	98.14% <0.00%> (+0.01%)	⬆️
mmpose/models/losses/mesh_loss.py	97.67% <0.00%> (+0.01%)	⬆️
...pose/models/keypoint_heads/top_down_simple_head.py	98.63% <0.00%> (+0.01%)	⬆️
...atasets/top_down/topdown_coco_wholebody_dataset.py	97.12% <0.00%> (+0.02%)	⬆️
mmpose/models/backbones/shufflenet_v1.py	97.38% <0.00%> (+0.03%)	⬆️
... and 24 more

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