Lazy broadcasts for reductions / more broadcasting customization docs#30939

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chethega wants to merge 2 commits intoJuliaLang:masterfrom chethega:broadcast_extradoc

+35-6

Commits on Feb 2, 2019

added another example for broadcasting customization
chethega
committed

Commits on Feb 12, 2019

added more explicit example for wrapping in a ref
chethega
committed