RFR: 8284702: Add @since for java.time.LocalDate.EPOCH

[Tesla I. Zhang‮]

On Tue, 12 Apr 2022 03:21:00 GMT, Glavo <duke at openjdk.java.net> wrote:

> `java.time.LocalDate.EPOCH` was introduced in Java 9, but there is no corresponding `@since` in the javadoc. The absence of `@since` makes it impossible for IDEs to check for misuse of it, it may be misused by users targeting Java 8 and crash at runtime.

This highly nontrivial change really requires a lot of people to review! But it looks pretty legitimate to me.

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Marked as reviewed by ice1000 at github.com (no known OpenJDK username).

PR: https://git.openjdk.java.net/jdk/pull/8192