docs: optimize form docs and example

[chouchouji]

Checklist

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• [ ] Fix linting errors
• [ ] Tests have been added / updated (or snapshots)

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[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
varlet	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 12, 2024 8:54am
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[pkg-pr-new[bot]]

Open in Stackblitz

@varlet/cli

``` pnpm add https://pkg.pr.new/@varlet/cli@1755 ```

@varlet/eslint-config

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@varlet/icons

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@varlet/import-resolver

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@varlet/preset-tailwindcss

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@varlet/preset-unocss

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@varlet/shared

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@varlet/touch-emulator

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@varlet/ui

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@varlet/use

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@varlet/vite-plugins

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commit: 4e254e0

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.87%. Comparing base (44c0756) to head (4e254e0). Report is 1 commits behind head on dev.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #1755 +/- ## ======================================= Coverage 92.87% 92.87% ======================================= Files 313 313 Lines 7470 7470 Branches 1875 1875 ======================================= Hits 6938 6938 Misses 466 466 Partials 66 66 ```

:umbrella: View full report in Codecov by Sentry.
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Deploying varlet with    Cloudflare Pages

Latest commit:	4e254e0
Status:	✅  Deploy successful!
Preview URL:	https://cc92074e.varlet.pages.dev
Branch Preview URL:	https://docs-ui.varlet.pages.dev

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