fix(NavigationMenu): standardising slot name

[roiLeo]

🔗 Linked issue

• ref feat(components): add new content-top and content-bottom slots #3886 (comment)

❓ 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

Standardising NavigationMenu slots name with other components

• list-leading => content-top
• list-trailing => content-bottom

Should we do it aswell for Tabs component?

📝 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@3961

commit: 34fde47

[benjamincanac]

No this is intended, the content-top and content-bottom slots are used inside a Content component but its not the same for NavigationMenu and Tabs components.