chore: minor refactor for weighted choose

[fengjiachun]

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What's changed and what's your intention?

As the title.

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

Attention: Patch coverage is 96.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.92%. Comparing base (758ad0a) to head (2c1903f).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4917      +/-   ##
==========================================
- Coverage   84.19%   83.92%   -0.28%     
==========================================
  Files        1137     1137              
  Lines      209796   210032     +236     
==========================================
- Hits       176646   176272     -374     
- Misses      33150    33760     +610     

[fengys1996]

The choose_multiple method in the WeightedChoose trait does not clearly state whether duplicate items are allowed to be returned, which may cause some confusion. cc @WenyXu

[WenyXu]

The choose_multiple method in the WeightedChoose trait does not clearly state whether duplicate items are allowed to be returned, which may cause some confusion. cc @WenyXu

It wouldn't by default, let's add some comments.