RFR: 8294807: Fix typos and clarify javadoc for SunToolKit.realsSync

[Alexey Ivanov]

On Tue, 4 Oct 2022 20:21:10 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

> I fixed the typo “serie” → "series" which was highlighted by a spellchecker.
> 
> I also simplified the description, fixed the grammar, added `{@code}` around types, added link to `requestFocus` in the example.

I need more time…

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PR: https://git.openjdk.org/jdk/pull/10563