docs: fix English oddities in README.md

[dandv]

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[CLAassistant]

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[HeJiachen-PM]

Thanks for the help on our English!

[nx-cloud]

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✅ Successfully ran 1 target

• nx test:coverage @affine/monorepo

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.11%. Comparing base (343572c) to head (645dcf4).

Additional details and impacted files

@@            Coverage Diff             @@
##           canary    #8622      +/-   ##
==========================================
- Coverage   70.17%   70.11%   -0.06%     
==========================================
  Files         536      536              
  Lines       33700    33700              
  Branches     3023     3023              
==========================================
- Hits        23648    23628      -20     
- Misses       9697     9717      +20     
  Partials      355      355              

Flag	Coverage Δ
server-test	77.01% <ø> (-0.07%)	⬇️
unittest	45.31% <ø> (ø)

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