[jfx19] RFR: 8286678: Fix mistakes in FX API docs [v2]

[Andy Goryachev]

On Fri, 19 Aug 2022 00:37:34 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

>> Fixes the mistakes in the JBS ticket and some additional minor corrections.
>
> Nir Lisker has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix typo

Would these changes require a CSR?  Or, since they are just corrections, the API did not really change?
Otherwise, looks good.  Thank you for cleaning up the docs!

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Marked as reviewed by angorya (Author).

PR: https://git.openjdk.org/jfx/pull/880