optimize: optimize the Readme and change documents

[slievrly]

• I have registered the PR changes.

Ⅰ. Describe what this PR did

optimize the Readme and change documents

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.46%. Comparing base (f226c66) to head (5dcd949).
Report is 1 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #7531      +/-   ##
============================================
- Coverage     60.50%   60.46%   -0.04%     
  Complexity      658      658              
============================================
  Files          1298     1298              
  Lines         49081    49081              
  Branches       5771     5771              
============================================
- Hits          29697    29679      -18     
- Misses        16750    16769      +19     
+ Partials       2634     2633       -1     

see 6 files with indirect coverage changes

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[xjlgod]

LGTM