add missing mode "giou" in comments for iou2d_calculator.py

[kaiyux]

Add missing mode "giou" in comment of mmdet/core/bbox/iou_calculators/iou2d_calculator.py. It made me a little confusing that I thought "giou" was not supported, hope this helps : )

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[codecov]

Codecov Report

Merging #4283 (99fb755) into master (3e902c3) will increase coverage by 0.03%.
The diff coverage is 42.85%.

@@            Coverage Diff             @@
##           master    #4283      +/-   ##
==========================================
+ Coverage   62.66%   62.70%   +0.03%     
==========================================
  Files         232      232              
  Lines       17597    17607      +10     
  Branches     2942     2945       +3     
==========================================
+ Hits        11028    11041      +13     
+ Misses       6031     6027       -4     
- Partials      538      539       +1     

Flag	Coverage Δ
unittests	62.66% <42.85%> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
...mdet/core/bbox/iou_calculators/iou2d_calculator.py	96.77% <ø> (ø)
mmdet/models/dense_heads/gfl_head.py	27.35% <ø> (ø)
mmdet/models/dense_heads/yolo_head.py	34.04% <ø> (ø)
mmdet/models/necks/pafpn.py	39.58% <0.00%> (-3.60%)	⬇️
mmdet/core/post_processing/bbox_nms.py	85.96% <33.33%> (-3.13%)	⬇️
mmdet/datasets/samplers/distributed_sampler.py	33.33% <50.00%> (+3.92%)	⬆️
mmdet/models/losses/cross_entropy_loss.py	100.00% <100.00%> (ø)
mmdet/models/necks/fpn.py	94.04% <100.00%> (+0.22%)	⬆️
mmdet/models/dense_heads/corner_head.py	76.77% <0.00%> (+1.91%)	⬆️
mmdet/models/detectors/cornernet.py	100.00% <0.00%> (+5.12%)	⬆️

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[ZwwWayne]

Hi @SiriusKY ,
Thanks for your kind PR. It indeed helps~

[OpenMMLab-Assistant-007]

Hi!
@kaiyux
First of all, we want to express our gratitude for your significant PR in the OpenMMLab project. Your contribution is highly appreciated, and we are grateful for your efforts in helping improve this open-source project during your personal time. We believe that many developers will benefit from your PR.

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