Revise the Fresnel example documentation

Revise the Fresnel example documentation to match the updated example.

List of changes:

• Controls for fresnel effect properties
• QML ReflectionProbes for the models
• Ability to move the camera
• Keyboard controls to move the monkey 3D model
• Added two additional 3D models, a mirror and a sphere that rotates around the monkey
• Added some informationfor the models in the scene
• Camera / fresnel property / monkey model position reset buttons