docs: add link from svelte-transition page to full transition docs

[yashlahase]

Adds helpful context link to svelte-transition docs

This PR adds a notice at the top of the /docs/svelte/svelte-transition page that links to the main transition documentation (/docs/svelte/transition).

Why:
Newcomers looking for information on animations and transitions using {#if} blocks land on svelte-transition, which is autogenerated and lacks context. The real documentation with examples is transition. This link reduces confusion and improves discoverability.

Changes:

• Added a NOTE callout at the top of the svelte-transition reference page
• Links to the main transition documentation for context and usage examples
• Follows existing documentation formatting patterns

The change is minimal and only adds helpful navigation for users who land on the reference page first.

[changeset-bot]

⚠️ No Changeset found

Latest commit: c7f4722

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-svelte-17297-svelte.vercel.app/