fix: Typography editable should focus at the end

[afc163]

🤔 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

close #21261

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Typography editable should focus at the end of textarea.
🇨🇳 Chinese	修复 Typography editable 时光标没有在输入框末位的问题。

☑️ 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

[tests-checker]

Could you please add tests to make sure this change works as expected?

[ant-design-bot]

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[codecov]

Codecov Report

Merging #21268 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #21268      +/-   ##
==========================================
+ Coverage   97.55%   97.56%   +<.01%     
==========================================
  Files         299      299              
  Lines        6967     6970       +3     
  Branches     1926     1879      -47     
==========================================
+ Hits         6797     6800       +3     
  Misses        170      170

Impacted Files	Coverage Δ
components/typography/Editable.tsx	100% <100%> (ø)	⬆️

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