docs: update README.md about the code block

[LinuxSuRen]

Closes #

Proposed Changes

Briefly describe your proposed changes:

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• Tests pass
• Commit messages are in semantic format
• Sign CLA (if not already signed)

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.99%. Comparing base (87b74a4) to head (332e50e).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #418   +/-   ##
=======================================
  Coverage   92.99%   92.99%           
=======================================
  Files          25       25           
  Lines        2326     2326           
=======================================
  Hits         2163     2163           
  Misses        123      123           
  Partials       40       40           

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[bednar]

@LinuxSuRen thx for your PR 👍