fix: Alert add css word break

[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

fix #18923

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Alert word break
🇨🇳 Chinese	Alert 标题和内容单词折行

☑️ 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

[netlify]

Deploy preview for ant-design ready!

Built with commit 6188287

https://deploy-preview-18929--ant-design.netlify.com

[zombieJ]

lint CI failed. Please check.

[codecov]

Codecov Report

Merging #18929 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #18929   +/-   ##
=======================================
  Coverage   96.92%   96.92%           
=======================================
  Files         281      281           
  Lines        7554     7554           
  Branches     2094     2063   -31     
=======================================
  Hits         7322     7322           
  Misses        230      230           
  Partials        2        2

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8b4bd0c...6188287. Read the comment docs.