Documentation was pointing to the deprecated DIALOG_BASED_UESR_INTERFACE
constant.

Change-Id: I68e8f226ee1c191ef6fe868c1e8897b90b46fdb0
Signed-off-by: Karsten Thoms <karsten.thoms@karakun.com>
Reviewed-on: https://git.eclipse.org/r/c/jdt/eclipse.jdt.ui/+/169107
Tested-by: JDT Bot <jdt-bot@eclipse.org>
Reviewed-by: Kalyan Prasad Tatavarthi <kalyan_prasad@in.ibm.com>