[9] Review Request: 6515713 example in JFormattedTextField API docs instantiates abstract class

[Sergey Bylokhov]

Hello.
Please review a small typo in jdk 9.

Bug: https://bugs.openjdk.java.net/browse/JDK-6515713
Webrev can be found at: http://cr.openjdk.java.net/~serb/6515713/webrev.00

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Best regards, Sergey.