RFC8259 obsoletes RFC7159. Fix a couple of URLs to point to the
newer version.
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <20181203175702.128701-1-eblake@redhat.com>
Reviewed-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>