doc: mention git-node in the collaborator guide#18960

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joyeecheung wants to merge 2 commits intonodejs:masterfrom joyeecheung:git-node-guide

+27-1

Commits on Feb 23, 2018

doc: mention git-node in the collaborator guide
joyeecheung
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Commits on Feb 24, 2018

squash! fix nits
joyeecheung
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