RFR (JDK 13) 8221533: Incorrect copyright header in DurationDayTimeImpl.java, DurationYearMonthImpl.java and XMLStreamException.java

[Brian Burkhalter]

+1 ,

> On Mar 27, 2019, at 12:51 PM, Joe Wang <huizhe.wang at oracle.com> wrote:
> 
> Please review a trivial fix for the missing commas in three class files.