[jfx20] RFR: 8293587: Fix mistakes in FX API docs [v5]

[Kevin Rushforth]

On Wed, 8 Feb 2023 00:12:14 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

>> Fixes and cleanup in the areas in the linked issue.
>
> Nir Lisker has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Addressed review comments

Marked as reviewed by kcr (Lead).

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PR: https://git.openjdk.org/jfx/pull/1025