Add a clamp() alias for constrain() or mention clamp in the docs

Increasing access

People who come from other frameworks and languages will have an easier time finding the relevant function for clamping numbers in p5.js.

Most appropriate sub-area of p5.js?

• Accessibility
• Color
• Core/Environment/Rendering
• Data
• DOM
• Events
• Image
• IO
• Math
• Typography
• Utilities
• WebGL
• Build process
• Unit testing
• Internationalization
• Friendly errors
• Other (specify if possible)

Feature enhancement details

The typical name for the constrain(x, min, max) function in p5.js, used across the math and computing world, is clamp. E.g. see OpenGL, Godot/Unity, C#, Java, CSS, and C++.
In comparision, less popular names include clip, used by Numpy and Octave/Mathematica/Wolphram, and, well, constrain, used by Processing/Arduino/P5.js and MakeCode.

Hence I think that it would make sense to either have clamp() as an alias to constrain() (ideal for me, as I always end up reaching for "clamp" before realizing it's different in p5), or to add a note in constrain()'s documentation that explains it's also known as clamp() elsewhere (which, together with https://github.com/processing/p5.js-website/issues/493 would allow people like me to find constrain() faster).

Start with the p5.js constrain() reference and the Math area identified in the issue. Determine whether the contribution should provide a clamp() alias or document clamp as an alternate name; done means the chosen option is available or discoverable through the constrain() documentation.