Accessibility fix for images.
Accessibility fix for images.

OneBitSoftware/PnP,OneBitSoftware/PnP,OneBitSoftware/PnP,vman/PnP,IvanTheBearable/PnP,OfficeDev/PnP,IvanTheBearable/PnP,OneBitSoftware/PnP,OfficeDev/PnP,jlsfernandez/PnP,PaoloPia/PnP,OfficeDev/PnP,PaoloPia/PnP,IvanTheBearable/PnP,jlsfernandez/PnP,PaoloPia/PnP,OfficeDev/PnP,russgove/PnP,PaoloPia/PnP,vman/PnP,vman/PnP,jlsfernandez/PnP,russgove/PnP,russgove/PnP