docs: Added docs link for March 2025 What's New - server route resolu…

[rtmorgan]

Added the docs link for SvelteKit #13379 for consistency with other "What's New" changes and news. The docs links for changes covered in the Svelte newsletter and blog updates are extremely useful and help make Svelte's community docs so awesome!

A note on documentation PRs

If this is a documentation PR (i.e. changing content within apps/svelte.dev/content/docs), then this is the wrong repository to make those changes. The content in this folder is synced from other repositories. Therefore, these changes should be made in their respective repositories (at https://github.com/sveltejs/svelte or https://github.com/sveltejs/kit, or example).

Before submitting the PR, please make sure you do the following

• It's really useful if your PR references an issue where it is discussed ahead of time.
• Prefix your PR title with feat:, fix:, chore:, or docs:.
• This message body should clearly illustrate what problems it solves.

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