RFR: 8283203: Fix typo in SystemTray.getTrayIconSize javadoc

[Alexey Ivanov]

On Tue, 17 Jan 2023 01:53:05 GMT, SWinxy <duke at openjdk.org> wrote:

> Please review this itty-bitty typo fix.

I submitted [JDK-8300280](https://bugs.openjdk.org/browse/JDK-8300280) regarding *“…the size **in pixels**…”*:
https://github.com/openjdk/jdk/blob/a9b9831f2a88ed3b7701d402b167a096b94aeb98/src/java.desktop/share/classes/java/awt/SystemTray.java#L346

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PR: https://git.openjdk.org/jdk/pull/12020