Fix method doc

[fbagci]

Fix method docstring typo

• Change m in second bbox shape with n
• Remove duplicated explanation for "is_aligned" parameter

[codecov]

Codecov Report

Merging #8512 (1952864) into dev (3b72b12) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev    #8512      +/-   ##
==========================================
+ Coverage   64.17%   64.20%   +0.03%     
==========================================
  Files         361      361              
  Lines       29530    29530              
  Branches     5020     5020              
==========================================
+ Hits        18951    18960       +9     
+ Misses       9576     9565      -11     
- Partials     1003     1005       +2     

Flag	Coverage Δ
unittests	64.17% <ø> (+0.02%)	⬆️

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	82.50% <ø> (ø)
mmdet/models/dense_heads/corner_head.py	69.72% <0.00%> (+1.38%)	⬆️
mmdet/models/roi_heads/mask_heads/maskiou_head.py	89.65% <0.00%> (+2.29%)	⬆️
mmdet/models/detectors/cornernet.py	100.00% <0.00%> (+5.12%)	⬆️

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