RFR: 8252546: Move ObservableValue's equality check and lazy evaluation descriptions to @implSpec [v3]

[Nir Lisker]

On Sat, 12 Sep 2020 14:35:49 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Marked as reviewed by kcr (Lead).
>
> I see that [SKARA-548](https://bugs.openjdk.java.net/browse/SKARA-548) is still an issue, and that the PR was marked
> ready without the CSR being approved.

Yeah I saw. The CSR has been submitted. I think that the bot isn't picking up on it even.

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PR: https://git.openjdk.java.net/jfx/pull/292