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

Sat Sep 12 14:39:52 UTC 2020

On Sat, 12 Sep 2020 14:25:53 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Nir Lisker has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Addressed review comments and added </li>
>
> 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.

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