Update dictionaries.md

[sage-gendron]

I believe this is just a typo that indicates the boolean check of 33 in person.values() would return False. This should be True.

Or, if there should be a negative example, we could change the 33 value to 34 or 'age' to indicate dict.values() only looks at values and not keys.

Apologies if this isn't the correct way to go about this!

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