chore: Refactor active-class-name example (#40670)

## Changes - Migrated missing file to typescript ## Documentation / Examples - [x] Make sure the linting passes by running `pnpm lint` - [x] The "examples guidelines" are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing/examples/adding-examples.md)
vercel · Sep 19, 2022 · 7f9fe8c · 7f9fe8c
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diff --git a/examples/active-class-name/pages/news.js → examples/active-class-name/pages/news.tsx b/examples/active-class-name/pages/news.js → examples/active-class-name/pages/news.tsx