Rollup merge of #43136 - jgallag88:bufWriterDocs, r=steveklabnik

Add warning to BufWriter documentation

When using `BufWriter`, it is very easy to unintentionally ignore errors, because errors which occur when flushing buffered data when the `BufWriter` is dropped are ignored. This has been noted in a couple places:  #32677, #37045.

There has been some discussion about how to fix this problem in #32677, but no solution seems likely to land in the near future. For now, anyone who wishes to have robust error handling must remember to manually call `flush()` on a `BufWriter` before it is dropped.  Until a permanent fix is in place, it seems worthwhile to add a warning to that effect to the documentation.

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