docs(input-number): add normal currency step size

[florian2peaches]

🔗 Linked issue

kinda Resolves #1722

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

It's kind of confusing that by default, this example doesn't allow you to input cents at all, so I changed that.
The UX of the +/- buttons is a bit worse with this step size, but at least it works now.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/ui@4624

commit: ffd1ffc

[florian2peaches]

I noticed there is :stepSnapping="false", would that be better?