Cleaned up typos and wording on operator-editing-code
Cleaned up typos and wording on operator-editing-code

changed once to one to make sense
changed your to you to make sense

Change-Id: Ia8f9c3d74cac2250f9bd1986c14632b6df14427e

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