fix(module: form): Help message change

[ElderJames]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• Bundle size optimization
• Performance optimization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

fixed #3371

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English
🇨🇳 Chinese

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

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

[github-actions]

[codecov]

Codecov Report

Patch coverage: 66.66% and project coverage change: -1.47% ⚠️

Comparison is base (c559bd3) 46.83% compared to head (3b01dc3) 45.37%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3373      +/-   ##
==========================================
- Coverage   46.83%   45.37%   -1.47%     
==========================================
  Files         558      558              
  Lines       26832    26836       +4     
  Branches      267      267              
==========================================
- Hits        12567    12176     -391     
- Misses      14225    14620     +395     
  Partials       40       40              

Files Changed	Coverage Δ
components/form/FormItem.razor.cs	40.88% <66.66%> (-30.23%)	⬇️

... and 21 files with indirect coverage changes

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