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],[20],[],[30,31,32]] == [[10,20,30],[11,31],[32]]

Trac metadata

Trac field	Value
Version	7.8.4
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Core Libraries
Test case
Differential revisions
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Related
Blocking
CC	core-libraries-committee@haskell.org
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Architecture