Fix terminology in Episode Class Methods

Minor terminology mixup in the episode "Class Methods", calling python decorator as "annotation". The "annotation" is from Java world, I believe. Line: https://gitlab.hzdr.de/hifis/software/education/hifis-workshops/workshop-oop-in-python/-/blob/main/workshop_materials/episodes/06-class-methods.md#L33

Edited Aug 17, 2022 by Ashis Ravindran

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