simplify std::io::Write::write rustdoc
The std::io::Write::write method currensly suggests consumers guaranteed that `0 <= n <= buf.len()`, for `Ok(n)`, however `n` is of type `usize` causing the compiler to emit a warning: ``` warning: comparison is useless due to type limits --> lib.rs:6:18 | 6 | Ok(n) => 0 <= n && n <= output.len(), | ^^^^^^ | = note: #[warn(unused_comparisons)] on by default ``` This PR removes the suggestion to check `0 <= n` since it is moot. r? @steveklabnik
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@ -1105,7 +1105,7 @@ pub trait Write {
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/// an [`Err`] variant.
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///
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/// If the return value is [`Ok(n)`] then it must be guaranteed that
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/// `0 <= n <= buf.len()`. A return value of `0` typically means that the
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/// `n <= buf.len()`. A return value of `0` typically means that the
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/// underlying object is no longer able to accept bytes and will likely not
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/// be able to in the future as well, or that the buffer provided is empty.
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///
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