Fix markdown errors

src/Python/GeometricObjects/Axes.md

src/Python/GeometricObjects/ColoredLines.md

src/Python/GeometricObjects/CylinderExample.md

src/Python/GeometricObjects/EllipticalCylinder.md

src/Python/GeometricObjects/LongLine.md

src/Python/GeometricObjects/OrientedArrow.md

src/Python/GeometricObjects/OrientedCylinder.md

src/Python/GeometricObjects/ParametricObjectsDemo.md

src/Python/GeometricObjects/ShrinkCube.md

src/Python/GeometricObjects/SourceObjectsDemo.md

src/Python/GeometricObjects/TessellatedBoxSource.md

src/Python/GeometricObjects/TriangleStrip.md