The text plays on the double meaning of the word 'features'. In one sense, 'features' refers to aspects or characteristics of a product that can be discovered by users. In another sense, it suggests that features should be naturally found or become apparent through use, rather than being explicitly described in documentation. However, this does not seem to involve a play on words or similar-sounding words, but rather a commentary on product design philosophy.
Features should be discovered , not documented !