url /get_cookie, not /get_cookies

[shouldnotappearcalm]

🤔 What is the nature of this change? / 这个变动的性质是？

• New feature / 新特性提交
• Fix bug / bug 修复
• Refactor code or style / 重构代码或样式
• Performance optimization / 性能优化
• Build optimization / 构建优化
• Website, documentation, demo improvements / 网站、文档、Demo 改进
• Test related / 测试相关
• Other / 其他

🔗 Related Issue / 相关 Issue

暂无

💡 Background or solution / 需求背景和解决方案

代码中是 /get_cookie，但是文档中写的url是 get_cookies，更正了README中的写法

@app.post("/get_cookie")

[shouldnotappearcalm]

PR Review

⏱️ Estimated effort to review [1-5]	1, because the PR involves a simple change in documentation text, correcting an API endpoint in two markdown files. The change is straightforward and does not involve complex code modifications.
🧪 Relevant tests	No
🔍 Possible issues	No
🔒 Security concerns	No

Code feedback:

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