server-master(engine): update readme

[amyangfei]

What problem does this PR solve?

Issue Number: ref #7728

What is changed and how it works?

• Refine document of server master

Check List

Tests

• No code

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• gozssky

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[codecov-commenter]

Codecov Report

Merging #7729 (f572929) into master (6d24a57) will increase coverage by 0.0305%.
The diff coverage is 71.3592%.

Additional details and impacted files

Flag	Coverage Δ
cdc	66.3338% <75.0000%> (+0.0319%)	⬆️
dm	52.1439% <56.1728%> (-0.0414%)	⬇️
engine	64.1746% <91.6666%> (+0.1777%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

@@               Coverage Diff                @@
##             master      #7729        +/-   ##
================================================
+ Coverage   59.9034%   59.9339%   +0.0305%     
================================================
  Files           810        814         +4     
  Lines         93255      93628       +373     
================================================
+ Hits          55863      56115       +252     
- Misses        32535      32635       +100     
- Partials       4857       4878        +21     

[amyangfei]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: f572929

[amyangfei]

/merge