[9] Review Request: 6470361 Swing's Threading Policy example does not compile

[Sergey Bylokhov]

Hello.
Please review the small documentation fix for jdk 9.

Bug: https://bugs.openjdk.java.net/browse/JDK-6470361
Webrev can be found at: http://cr.openjdk.java.net/~serb/6470361/webrev.00

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Best regards, Sergey.