Made LoadIDFFromNexus load just the instrument. re #8709
update doc for to refer to new wiki page. re #8709
Revert "update doc for to refer to new wiki page. re #8709"

This reverts commit e50f761b38d03233033797b357e28c96b9be461a.
Merge remote-tracking branch 'origin/feature/8709_loadIDF'