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auto merge of rust-lang#14258 : alexcrichton/rust/dox-format-writer, r=cmr
This commit fills in the documentation holes for the FormatWriter trait which
were previously accidentally left blank. Additionally, this adds the `write_fmt`
method to the trait to allow usage of the `write!` macro with implementors of
the `FormatWriter` trait. This is not useful for consumers of the standard
library who should generally avoid the `FormatWriter` trait, but it is useful
for consumers of the core library who are not using the standard library.
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