docs(demo): Convert to lowercase

[thinkasany]

[中文版模板 / Chinese template]

🤔 This is a ...

• Demo update

🔗 Related issue link

💡 Background and solution

1. 语法上来说这个 Want 应该用的是小写
2. 并且其他地方也都是小写，可以统一一下～
   

📝 Changelog

Language	Changelog
🇺🇸 English	docs(demo): Convert to lowercase
🇨🇳 Chinese	docs(demo): 标题转小写

☑️ Self-Check before Merge

⚠️ Please check all items below before requesting a reviewing. ⚠️

• 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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[github-actions]

Visual Regression Build for PR #48415 Failed ❌

Potential causes:

• upstream workflow status: failure upstream job link
• download report artifact status: failure
• report upload status: skipped

[github-actions]

[Wxh16144]

hhhh，这 PR 是不是都可以不用跑 ci 了，应该也不会影响快照

[li-jia-nan]

hhhh，这 PR 是不是都可以不用跑 ci 了，应该也不会影响快照

有点担心快照问题，还是跑完吧

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (ead7f7d) to head (6403f26).

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #48415   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          744       744           
  Lines        12866     12866           
  Branches      3366      3366           
=========================================
  Hits         12866     12866           

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