[jfx16] RFR: 8262460: Create release notes for JavaFX 16 [v3]

[Abhinay Agarwal]

On Tue, 2 Mar 2021 19:00:07 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

>> Abhinay Agarwal has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR.
>
> doc-files/release-notes-16.md line 20:
> 
>> 18: [JDK-8176270](https://bugs.openjdk.java.net/browse/JDK-8176270)|Adding ChangeListener to TextField.selectedTextProperty causes StringOutOfBoundsException|controls
>> 19: [JDK-8255415](https://bugs.openjdk.java.net/browse/JDK-8255415)|Nested calls to snap methods in Region give different results|graphics
>> 20: [JDK-8246343](https://bugs.openjdk.java.net/browse/JDK-8246343)|Fix mistakes in FX API docs|other
> 
> This one is from an older version.

All original issues are added to the Release Notes if an issue is a backport issue. It seems like there is backport issue against JDK-8246343 with fix version `openjfx16`.

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PR: https://git.openjdk.java.net/jfx/pull/414