Fix the docs and Debug output of BufWriter. #588
Merged
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The BufWriter docs inaccurately stated that it flushes on drop, which it does not do. This PR changes the docs, as well as the example, to highlight that the user must explicitly flush a bufwriter.
There were also two places where the BufWriter code referred to it as a BufReader: in the link to the std docs, and in the Debug output. Those have also been fixed.
Closes #586