Links from the API reference to Instant leads to non-existent page

[fzhinkin]

After kotlinx.datetime.Instant was deprecated, it is no longer included into the generated API reference and all [Instant] references leads nowhere (try clicking on Instant here https://kotlinlang.org/api/kotlinx-datetime/kotlinx-datetime/kotlinx.datetime/-local-date-time/).

Moreover, KDoc should no longer refer to kotlinx.datetime.Instant.