io: tweak Reader comment
I think this has the same meaning as before, but the text is tighter, and it makes some people happy. Fixes #10182. Change-Id: I7ee1eae4bcd6ee4a5898ea948648939e6bde5f01 Reviewed-on: https://go-review.googlesource.com/11674Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Rob Pike <r@golang.org>
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