Update Segmentation Utilities Documentation (smaller files)
Summary: Replaces D968. Screenshots are now up-to-date and taken on a smaller resolution
Test Plan: Open F1 help for utilities
Reviewers: O1 MITK Reviewer Group I, kislinsk
Reviewed By: O1 MITK Reviewer Group I, kislinsk
Differential Revision: https://phabricator.mitk.org/D969