Documentation: Update Edge Artifacts Page to Use Cameras

[pushfoo]

Documentation request:

Per my understanding of discussion on Discord, the set_viewport function will be removed in favor of using Cameras in 3.0.

If this is the case, the edge artifacts page needs to be updated after the following occur:

1. I merge my SpriteList doc changes
2. set_viewport is removed

I can take care of this after my doc changes. We may also want to think about cleaning up that page in general.

[pushfoo]

I'm also considering adding a camera subclass or flag which snaps the viewport to whole pixels or validates it.

[DragonMoffon]

will do as part of camera refactor

[einarf]

This should not be a problem any more except in extreme situations. It's explained in relation to the border size parameter on the atlas.