[Fix] Fix typos and error in comments

[yezhen17]

No description provided.

[codecov]

Codecov Report

Merging #308 (cb23822) into master (ac9a3e8) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #308   +/-   ##
=======================================
  Coverage   50.23%   50.23%           
=======================================
  Files         173      173           
  Lines       11585    11585           
  Branches     1803     1803           
=======================================
  Hits         5820     5820           
  Misses       5404     5404           
  Partials      361      361           

Flag	Coverage Δ
unittests	50.23% <100.00%> (ø)

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Impacted Files	Coverage Δ
mmdet3d/models/fusion_layers/point_fusion.py	37.62% <ø> (ø)
mmdet3d/models/dense_heads/centerpoint_head.py	47.01% <100.00%> (ø)

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