docs: clarify the meaning of the rev tag and tool version specification

[shenxianpeng]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 60e6b17c-f723-4e86-a72f-a60b400f6a50

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Reviewing files that changed from the base of the PR and between 49766b0 and 3d45520.

📒 Files selected for processing (1)

• README.md

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.41%. Comparing base (49766b0) to head (3d45520).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #189   +/-   ##
=======================================
  Coverage   95.41%   95.41%           
=======================================
  Files           4        4           
  Lines         109      109           
=======================================
  Hits          104      104           
  Misses          5        5           

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