RFR: 8243587: Missing comma in copyright header

[Kim Barrett]

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.