fix typo
Merge pull request #2918 from jw2013/typo

fix typo
introduce Enum.reverse/3
Merge pull request #2885 from jw2013/list

Introduce Enum.reverse_slice/3
Add Integer.undigits/2
Merge pull request #2921 from lstor/integer-undigits

Add implementation of Integer.undigits
Fix broken IO.ANSI.Docs parser