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

[Kevin Rushforth]

On Tue, 23 Aug 2022 11:37:38 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

>> modules/javafx.graphics/src/main/java/javafx/concurrent/ScheduledService.java line 130:
>> 
>>> 128:  * will treat that duration as if it were Duration.ZERO. Likewise, any Duration which answers true
>>> 129:  * to {@link javafx.util.Duration#isIndefinite()} will be treated as if it were a duration of Double.MAX_VALUE
>>> 130:  * milliseconds. Any {@code null} Duration is treated as Duration.ZERO. Any custom implementation of a backoff strategy
>> 
>> Since you changed `null` to use code style, maybe also do it for `Duration.ZERO`?
>
> There are many places that are missing it in this class. Should I do them all while here?

I'll leave that up to you.

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