Update generators.md
The output of the generator example is the other way round.
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Thanks for the PR -- I updated that example in https://github.com/exaloop/codon/pull/85/commits/91272b1580b0face2bd816ab76e55879e397367b. in this case I think it makes more sense to modify the gen function itself as the current version is a bit unintuitive, which is what's done in that commit.
Thank you for this very exciting project! I really hope, it takes off.