Better documentation/examples/diagrams around variants and distributions

[markphelps]

IMO there isn't great documentation on what you can do with variants, segments, rules and distributions.

It might make sense to add more examples that show how this could be used, much like in examples/basic, but examples/targeting?

Also would be nice if these abilities could somehow be expressed better in diagrams or even just in words, kind of like what LaunchDarkly does with targeting users, but maybe not as verbose.

[stale]

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