docs: add default for `fakeTimers.toFake`

[hi-ogawa]

Description

• Related https://github.com/vitest-dev/vitest/issues/4004

Not sure if this is a right way, but I patched @types/sinonjs__fake-timers to update jsdoc. I guess it'll work since it's bundled, but please let me know if there is a better approach to this.

It's expected to appear like this:

screenshot

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