fix a spelling error, closes 1284770
fix a spelling error, closes 1284770

Change-Id: I5178463bf77f245e4f9c1e067636fca465b882e3

harrisonfeng/training-guides,harrisonfeng/training-guides,harrisonfeng/training-guides,Nabs007/training-guides,Nabs007/training-guides,openstack/training-guides,openstack/training-guides,Nabs007/training-guides