chore: fix some typos in comment

[jiangmencity]

No description provided.

[nagisa]

Thanks!

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 70.71%. Comparing base (515b5fa) to head (a447b6f).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
chain/chain/src/store/mod.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12757      +/-   ##
==========================================
- Coverage   70.72%   70.71%   -0.01%     
==========================================
  Files         849      849              
  Lines      174675   174675              
  Branches   174675   174675              
==========================================
- Hits       123539   123529      -10     
- Misses      45957    45969      +12     
+ Partials     5179     5177       -2     

Flag	Coverage Δ
backward-compatibility	0.16% <0.00%> (ø)
db-migration	0.16% <0.00%> (ø)
genesis-check	1.35% <0.00%> (ø)
linux	69.18% <0.00%> (-0.01%)	⬇️
linux-nightly	70.32% <0.00%> (-0.01%)	⬇️
pytests	1.64% <0.00%> (ø)
sanity-checks	1.46% <0.00%> (ø)
unittests	70.55% <0.00%> (-0.01%)	⬇️
upgradability	0.20% <0.00%> (ø)

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