doc: fix exec stdout & stderr default type in child_process#7361

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sartrey wants to merge 3 commits intonodejs:masterfrom sartrey:master

+4-4

Commits on Jun 22, 2016

fix doc about child_process exec & execFile
sartrey
committed

Commits on Jun 23, 2016

fix words & wrap lines at almost 80 charaters
sartrey
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Commits on Jun 25, 2016

exactly wrap at 80 chars
sartrey
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