Remove trailing comma from standalone Xref.

MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Remove trailing comma from ending Xref.

MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Remove trailing comma from ending Xref

MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Remove trailing comma from ending Xref

MFC after:	3 days
Sponsored by:	The FreeBSD Foundation