Auto merge of #21860 - mdinger:enum_rewording, r=steveklabnik

Second try to address https://github.com/rust-lang/rust/issues/21196 . A lot that was removed at the end basically seemed repetitive showing simple variations on the same type. It seems more effective to just show more variants at the beginning instead.

If you want to pack values into an example, better to use `i32` or some digit than `String` because you don't need the `to_string()` method.

I didn't mention `derive` because:
* I can't explain it (only use it)
* I don't have a link to a good description (maybe rustbyexample but you probably want links internal)
* Giving more detail especially stating that `==` won't work and why should help quite a bit

I didn't `make test` or check links but I will if this will be merged.

@steveklabnik 

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