Dan Wilhelm 9590082848 fix: update iterator and macro text for typos and clarity ...

- /macros/README.md: Typo "modules" => "macros"
- iterators2.py: Reduce line length to <90-char width.
- iterators4.py: Update 'fun' => 'challenge' as per PR#177
- rustlings hint iterators4: improve clarity

2020-04-29 19:11:54 -07:00

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