io: clarify Reader returning 0, nil
Fixes #8317. LGTM=bradfitz R=bradfitz, iant, r CC=golang-codereviews https://golang.org/cl/143100043
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Fixes #8317. LGTM=bradfitz R=bradfitz, iant, r CC=golang-codereviews https://golang.org/cl/143100043