docs(VerticalNavigation): add truncate in icon slot example

[pacmandoh]

🔗 Linked issue

none

❓ 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

Fix the label displaying beyond the container in the VerticalNavigationExampleIconSlot on mobile devices.

• Before

• After

📝 Checklist

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

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[benjamincanac]

Thanks 😊

[pacmandoh]

Thanks 😊

my pleasure!