[CURVE]: Further document animated/3D curves

[Cloud7050]

The curve module's summary currently defines terms specific to it such as point, curve, curve transformation, curve drawer etc. Its function documentation also provides some simple example code snippets illustrating their use.

3D curves, animated curves, and 3D animated curves etc are more recent additions. They could benefit from further documentation, such as by being added to the summary and including additional example code snippets where relevant.