createShader() documentation missing on correct usage with createGraphics()

[itsgalo]

Topic

It would be great to add a note and perhaps an example on the correct usage for createShader() on separate createGraphics() objects. It is not clear that to create a shader on non-main-canvas renderers, one has to call the function on the renderer object created by createGraphics(), as in: renderer.createShader(vert, frag). This would clarify the usage when using multiple shaders on different canvases.

See: https://p5js.org/reference/#/p5/createShader

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