Fix typo

Change-Id: I2b2680dfcac400d582124ad84399e41891afb695
Reviewed-on: https://gerrit.libreoffice.org/72259Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Tested-by: Julien Nabet <serval2412@yahoo.fr>

desktop/test/deployment/update/license/readme.txt

-The extensions contain a license which is displayed during installation. If a the license is displayed during a update can be determined by the attribute
+The extensions contain a license which is displayed during installation. If the license is displayed during an update can be determined by the attribute
 /description/registration/simple-license/@suppress-on-update
 
 The default value is false, which means that the attribute is not set, then the license is displayed during an update.