doc: minor updates to onboarding doc - #8060

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Trott wants to merge 3 commits into

nodejs:masterfrom

Trott:allaboard

Commits on Aug 12, 2016

doc: minor updates to onboarding doc
Trott
committed
346b964
squash: typo fix
Trott
committed
3f17c9f
squash: remove colons from headers
Trott
committed
981270f