docs: unknown config entry <show_limit_quota_header> in ai-token-ratelimit plugin

[qshuai]

 修复ai-token-ratelimit插件的文档错误，关联issue： 3165

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Fix the documentation error of ai-token-ratelimit plugin, related issue: 3165

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[hanxiantao]

@qshuai 需要签署下CLA

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.50%. Comparing base (ebbcb15) to head (c84b18b).
⚠️ Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3241      +/-   ##
==========================================
+ Coverage   46.58%   47.50%   +0.92%     
==========================================
  Files          87       90       +3     
  Lines       12922    13345     +423     
==========================================
+ Hits         6020     6340     +320     
- Misses       6516     6582      +66     
- Partials      386      423      +37     

Flag	Coverage Δ
wasm-go-plugin-ai-token-ratelimit	66.66% <ø> (?)

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see 6 files with indirect coverage changes

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[qshuai]

@qshuai 需要签署下CLA

@qshuai needs to sign CLA

Done

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@qshuai needs to sign a CLA

@qshuai needs to sign CLA

Done