[9] Review Request: 8013820 JavaDoc for JSpinner contains errors

[Sergey Bylokhov]

Hello.
Please review the fix for a typo in jdk9.

Bug: https://bugs.openjdk.java.net/browse/JDK-8013820
Webrev can be found at: http://cr.openjdk.java.net/~serb/8013820/webrev.00

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Best regards, Sergey.