chore: correct example config file

[WenyXu]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

correct example config file

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.78%. Comparing base (cf0c84b) to head (d86de24).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5105      +/-   ##
==========================================
- Coverage   84.03%   83.78%   -0.25%     
==========================================
  Files        1159     1162       +3     
  Lines      216717   216740      +23     
==========================================
- Hits       182109   181599     -510     
- Misses      34608    35141     +533