Add describe() to all 3D related examples in documentation

[aceslowman]

Increasing Access

As it is already present in a number of other examples, continuing to add describe() to examples is a good opportunity to make the documentation more accessible and also raise the visibility of describe() to encourage more use.

Most appropriate sub-area of p5.js?

• Accessibility (Web Accessibility)
• Build tools and processes
• Color
• Core/Environment/Rendering
• Data
• DOM
• Events
• Friendly error system
• Image
• IO (Input/Output)
• Localization
• Math
• Unit Testing
• Typography
• Utilities
• WebGL
• Other (specify if possible)

Feature enhancement details

This will consist of editing the reference examples of each method to contain describe() with descriptive text. I'll assign this task to myself and will be focusing on any 3D related methods as that is my focus for GSOC 2022.

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[aceslowman]

I don't think I have the ability to assign myself on this task, but this is something I am working on and will make a pull request when finished.