Localized compat merge docs link to merge.ts and return 404

## Bug

The localized `compat/object/merge` docs link to `merge.ts`, which leads to a 404 on the docs site.

## Affected pages

- `/ko/reference/compat/object/merge.html`
- `/ja/reference/compat/object/merge.html`
- `/zh_hans/reference/compat/object/merge.html`

## Note

The English page already uses the correct docs link pattern.

I will open a PR to fix the localized docs links.
