docs: Fix migration doc crash (#975)

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## Description

The docs site generator didn't like the info box in the migrations docs,
so I added it in another way

## Type of Change

<!--- Put an `x` in all the boxes that apply: -->

- [ ] ✨ `feat` -- New feature (non-breaking change which adds
functionality)
- [ ] 🛠️ `fix` -- Bug fix (non-breaking change which fixes an issue)
- [ ] ❌ `!` -- Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] 🧹 `refactor` -- Code refactor
- [ ] ✅ `ci` -- Build configuration change
- [x] 📝 `docs` -- Documentation
- [ ] 🗑️ `chore` -- Chore

Author: spydon

docs/guides/migrations.mdx

@@ -45,10 +45,11 @@ environment:
 resolution: workspace
 ```
 
-> [!NOTE]
-> You have to use Dart SDK 3.9.0 or newer to use pub workspaces reliably.
-> If you are using an older version of the Dart SDK, you can still use Melos
-> with pub workspaces, but then you have to rely on the `7.0.0-dev.x` versions.
+<Info>
+You have to use Dart SDK 3.9.0 or newer to use pub workspaces reliably.
+If you are using an older version of the Dart SDK, you can still use Melos
+with pub workspaces, but then you have to rely on the `7.0.0-dev.x` versions.
+</Info>
 
 ### 'melos analyze` no longer exists