I tested on a QFX5100 running 14.1X53-D26 and you can neither set no-auto nor delete auto-negotiation (as URL states) for 10GE or xe interfaces. See output below:
{master:0}[edit]
rmcgovern@WFD-QFX5100-48S-08# delete interfaces xe-0/0/0 ether-options auto-negotiation
warning: statement not found
So that URL link is inaccurate. I have opened feedback for this situation.
Just FYI.