Clarify Process::wait() callback behaviour#7099

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Lilchef wants to merge 2 commits intosymfony:3.1from

Lilchef:patch-1

Commits on Oct 28, 2016

Clarify Process::wait() callback behaviour
Lilchef
authored

Commits on Nov 1, 2016

Made comment in wait() example consistent with previous ones
Lilchef
authored