Data.List.transpose needs more docs
as mentioned by Doug McIlroy on haskell-prime.
My preference in the interest of brevity would be to not include the equations that Doug mentioned and simply add his nicely constructed educating example to the docs:
The transpose function transposes the rows and columns of its argument. For example,
transpose [[1,2,3],[4,5,6]] == [[1,4],[2,5],[3,6]]
If some of the rows are shorter than the following rows, their elements are skipped:
transpose [[10,11],,,[30,31,32]] == [[10,20,30],[11,31],]