Add missing Wrapping methods, use doc_comment!#49393

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clarfonthey wants to merge 4 commits intorust-lang:masterfrom

clarfonthey:wrapping

Commits on Mar 26, 2018

Add signed-specific methods to Wrapping<T>.
Clar Charr
committed

Commits on Apr 2, 2018

Add {is, next}_power_of_two to num::Wrapping

scottmcm
authored and
Clar Roʒe
committed

Commits on Apr 3, 2018

Fix doctests

scottmcm
authored and
Clar Roʒe
committed

Commits on Apr 4, 2018

Actually fix the doctests
scottmcm
committed