fix incorrect named param for "Style"

[exoad]

Description

the name for the "List" parameter was "rules" which does not align with the code which prompts for a named parameter called "styles"

Type of Change

• [ ] ❌ Breaking change
• [ ] ✨ New feature or improvement
• [ ] 🛠️ Bug fix
• [ ] 🧹 Code refactor
• [X] 📝 Documentation
• [ ] 🗑️ Chore

Ready Checklist

• [X] I've read the Contribution Guide.
• [X] In case this PR changes one of the core packages, I've modified the respective CHANGELOG.md file using the semantic_changelog format.
• [ ] I updated/added relevant documentation (doc comments with ///).
• [ ] I added myself to the AUTHORS file (optional, if you want to).

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[exoad]

see https://github.com/schultek/jaspr/blob/098db73cc7bd28dd0c0d4361e8ce8b8a8a27fa30/packages/jaspr/lib/src/components/style.dart#L6

[cybertheory]

I think because it refers to the StyleRule object which is a