Changed Documentation for Image Statitics: T27097
Summary: added new images, adapted text
Test Plan: needs review check
Reviewers: O3 MITK Reviewer Group II, O4 MITK Reviewer Group III, kalali, floca, O1 MITK Reviewer Group I
Reviewed By: O3 MITK Reviewer Group II, O4 MITK Reviewer Group III, kalali, floca, O1 MITK Reviewer Group I
Subscribers: gao, floca, kalali
Maniphest Tasks: T27097
Differential Revision: https://phabricator.mitk.org/D392