docs(integrations/icons): Update code example for custom icons

[c0lt]

❓ 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

I wanted to use a custom component and followed the docs but I always got an error that my icon could not be loaded. After spending some time trying to figure out if there are problems with my icon, I found that it works when using a colon : before the icon name.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e1404d95-301e-43c7-a5b8-20bc87d63adb

📥 Commits

Reviewing files that changed from the base of the PR and between 8897318 and 3549bea.

📒 Files selected for processing (1)

• docs/content/docs/1.getting-started/6.integrations/1.icons/1.nuxt.md

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📝 Walkthrough

Walkthrough

Updated the Nuxt “Custom local collections” example to use i-custom:add instead of i-custom-add in the UIcon component.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the docs update for the custom icon code example.
Description check	✅ Passed	The description is directly related to the documented custom icon name format change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/ui@6762

commit: 3549bea