Checking and updating Python files and test images

src/Python.md

src/Python/Annotation/MultiLineText.py

src/Python/Annotation/TextOrigin.py

src/Python/Arrays/GetValues.py

src/Python/Arrays/RenameArray.py

src/Python/CompositeData/CompositePolyDataMapper.py

src/Python/CompositeData/MultiBlockDataSet.py

src/Python/CompositeData/OverlappingAMR.py

src/Python/ExodusII/ReadExodusData.py

src/Python/IO/ReadExodusData.md

src/Python/IO/ReadExodusData.py

src/Python/Visualization/KochSnowflake.py