Correct typo of STEYX example

Change-Id: I4864cb3366dd12f2484b614e9ca418cad2440a71
Reviewed-on: https://gerrit.libreoffice.org/11556
Reviewed-by: Joren De Cuyper <jorendc@libreoffice.org>
Tested-by: Joren De Cuyper <jorendc@libreoffice.org>