Fixing OrientedArrow, OrientedCylinder, Plane.

src/Cxx.md

src/Cxx/GeometricObjects/Line.cxx

src/Cxx/GeometricObjects/OrientedArrow.cxx

src/Cxx/GeometricObjects/OrientedArrow.md

src/Cxx/GeometricObjects/OrientedCylinder.cxx

src/Cxx/GeometricObjects/OrientedCylinder.md

src/Cxx/GeometricObjects/Plane.cxx

src/Python.md

src/Python/GeometricObjects/Line.py

src/Python/GeometricObjects/OrientedArrow.md

src/Python/GeometricObjects/OrientedArrow.py

src/Python/GeometricObjects/OrientedCylinder.md

src/Python/GeometricObjects/OrientedCylinder.py

src/Python/GeometricObjects/Plane.py