Modify a few tutorial messages according to the z/Z changes.

Signed-off-by: evktalo <evktalo@users.sourceforge.net> (cherry picked from commit ba32b4c6d13011afc9e89b01c9a4aba693f2a7b0)

Created by  evktalo  on October 6, 2009
QHRZ32LDMV4PGHNHZXJDAJGMZMFBKXDCHNXNSSXA4ANDFQXYOOGAC
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