RFR: 8243587: Missing comma in copyright header

Please review this fix for a missing comma in the copyright header for src/jdk.incubator.jpackage/share/classes/jdk/incubator/jpackage/internal/DottedVersion.java. CR: https://bugs.openjdk.java.net/browse/JDK-8243587 Webrev: https://cr.openjdk.java.net/~kbarrett/8243587/webrev/ Testing: Tested locally (linux-x64): make validate-headers fails without the change, succeeds with it.