docs: fix svg type override

[sapphi-red]

Description

See #12043

Demo: https://stackblitz.com/edit/vitejs-vite-7xwuyv?file=src%2Fmain.ts&terminal=dev

superseds close #12043

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the PR Title Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[bluwy]

Ah I tried this before but it didn't work because I'm using /// <reference types="./test.d.ts" /> instead (additional .d.ts part). Looks like omitting it works!