docs: fix comments for StreamToolCallChecker

[Singularity0909]

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修正 StreamToolCallChecker 注释

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[Singularity0909]

@mrh997 麻烦推进下 ci~

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.95%. Comparing base (7e1de92) to head (65ea091).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #525      +/-   ##
==========================================
+ Coverage   78.88%   78.95%   +0.06%     
==========================================
  Files         123      123              
  Lines       11520    11520              
==========================================
+ Hits         9088     9096       +8     
+ Misses       1711     1703       -8     
  Partials      721      721              

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