Improve "hash brownies" example and explanation #76
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I found the current "hash brownies" example and explanation confusing, so I'm proposing these changes.
This is clearer because it focuses on equivalence as the key principle first, without muddying the waters with hashing and immutability up front.
Once this does mention hashing, it explains it in the context of being a performance optimization (which is all it is), not as something that is central to what containment in a dict actually means.
Hope this helps!