Correct docstring data type

[SeongjaeHong]

#4753
Docstring data type correction

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #4770 (2a473b2) into master (4febf34) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4770      +/-   ##
==========================================
+ Coverage   63.70%   63.75%   +0.04%     
==========================================
  Files         252      252              
  Lines       19809    19809              
  Branches     3373     3373              
==========================================
+ Hits        12620    12629       +9     
+ Misses       6514     6502      -12     
- Partials      675      678       +3     

Flag	Coverage Δ
unittests	63.71% <ø> (+0.04%)	⬆️

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

Impacted Files	Coverage Δ
...els/roi_heads/roi_extractors/base_roi_extractor.py	66.66% <ø> (ø)
...heads/roi_extractors/single_level_roi_extractor.py	69.38% <ø> (ø)
mmdet/models/dense_heads/corner_head.py	75.60% <0.00%> (+1.87%)	⬆️
mmdet/models/detectors/cornernet.py	100.00% <0.00%> (+5.12%)	⬆️

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[ZwwWayne]

Hi @gtw04 ,
Thanks for your kind contribution. Could you sign the CLI fully?