chore: update comment about MaxKeepBodySize option

[welkeyever]

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chore

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• [x] The description of this PR title is user-oriented and clear enough for others to understand.
• [ ] Attach the PR updating the user documentation if the current PR requires user awareness at the usage level. User docs repo

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更新有关 MaxKeepBodySize 选项的注释

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (82f9bfa) 82.55% compared to head (afa2fdc) 82.60%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1024      +/-   ##
===========================================
+ Coverage    82.55%   82.60%   +0.05%     
===========================================
  Files           98       98              
  Lines         9974     9974              
===========================================
+ Hits          8234     8239       +5     
+ Misses        1244     1240       -4     
+ Partials       496      495       -1     

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