stream, doc: resume a stream after pipe() and unpipe()
Clarifies the behavior of streams when _readableState.flowing is false. resume() must be called explicitly for the 'data' event to be emitted again.
Fixes: https://github.com/nodejs/node/issues/1041
Checklist
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documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc, stream