docs(rust): Solve inconsistency between code and comment

[YichiZhang0613]

This PR fixed some inconsistency between code and comment in #15968 .

Closes #15968

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.95%. Comparing base (16245cd) to head (214e7f5).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16135      +/-   ##
==========================================
- Coverage   80.96%   80.95%   -0.01%     
==========================================
  Files        1386     1386              
  Lines      178440   178438       -2     
  Branches     2883     2882       -1     
==========================================
- Hits       144469   144452      -17     
- Misses      33478    33492      +14     
- Partials      493      494       +1     

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[codspeed-hq]

CodSpeed Performance Report

Merging #16135 will improve performances by 26.38%

_{Comparing YichiZhang0613:fix_inconsistency (214e7f5) with main (475bac5)}

Summary

⚡ 1 improvements
✅ 34 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	YichiZhang0613:fix_inconsistency	Change
⚡	test_filter2	2.8 ms	2.2 ms	+26.38%

[stinodego]

Thanks for the fix!