docs: fix range-picker docs error

[yoyo837]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

ref: #8355 and #17373
close #20557

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English
🇨🇳 Chinese	修复 range-picker onCalendarChange 文档相关错误

☑️ Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

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View rendered components/date-picker/index.en-US.md
View rendered components/date-picker/index.zh-CN.md

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[codecov]

Codecov Report

Merging #20926 into 3.x-stable will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           3.x-stable   #20926   +/-   ##
===========================================
  Coverage       97.82%   97.82%           
===========================================
  Files             286      286           
  Lines            7753     7753           
  Branches         2140     2185   +45     
===========================================
  Hits             7584     7584           
  Misses            169      169

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