[whatwg/dom] Missing Documentation - WebGLContextAttributes (#942)

It seems there is no documentation for the WebGLContextAttributes dictionary.
The missing documentation results in gaps in auto-generated documentation for rendering libraries, i.e [Babylon.js - EngineOptions](https://doc.babylonjs.com/typedoc/interfaces/babylon.engineoptions). 

My limited understanding of what's going on is that Babylon extends Typescript Definitions and Typescript in turn fetches comments from whatwg.

WebGLContextAttributes definitions can be found on the [WebGL Context Attributes Spec](https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.2).

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