jfx:javafx-runtime element no longer used

User asked about the href attribute for the jfx:javafx-runtime element in the example at http://docs.oracle.com/javase/8/docs/technotes/guides/deploy/deploy_swing_apps.html#CIHECFCB

According to Danno Ferrin, this element is outdated and is ignored if present.

To avoid confusing users, references to this element need to be removed from the Deployment Guide.