Fix some typos, including a few that lead to non-functioning code. Change-Id: I99e6f290189ec7451a7ceffb14f5ac2a1159673f
includes new screenshots for some tutorials and a new sample images zip file Bug:2338253
Bug: 2160782 Change-Id: Ib1eb2e9e3fe3a7b2ad16387dbf888646a1195221