fix: modify textarea resize demo defaultValue to english

[hi-rustin]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
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🔗 Related issue link

💡 Background and solution

我发现其他的默认值一般都是英文的，但是 textarea resize 例子的默认值是中文的。
我保持内容不变，改成了英文。

📝 Changelog

Language	Changelog
🇺🇸 English	modify TextArea resize demo defaultValue to english
🇨🇳 Chinese	修改 TextArea resize 例子中的 defaultValue 为中文

☑️ 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/input/demo/textarea-resize.md

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[codecov]

Codecov Report

Merging #19348 into master will not change coverage.
The diff coverage is n/a.

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  Branches     2158     2109   -49     
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  Hits         7471     7471           
  Misses        168      168

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[hi-rustin]

pass all test