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Remove duplicate not done comment

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As indicated in #259 , I found it confusing to have 2 comments as the code wouldn't compile unless I solved both issues (I used the script from #281 to remove a comment and use `:wn` to go to next exercise, hence this tripped me).
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Tonći Galić 2020-04-07 17:00:45 +02:00 committed by GitHub
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exercises/conversions/as_ref_mut.rs
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@ -2,7 +2,6 @@
// Read more about them at https://doc.rust-lang.org/std/convert/trait.AsRef.html // Read more about them at https://doc.rust-lang.org/std/convert/trait.AsRef.html
// and https://doc.rust-lang.org/std/convert/trait.AsMut.html, respectively. // and https://doc.rust-lang.org/std/convert/trait.AsMut.html, respectively.
// I AM NOT DONE
// Obtain the number of bytes (not characters) in the given argument // Obtain the number of bytes (not characters) in the given argument
// Add the AsRef trait appropriately as a trait bound // Add the AsRef trait appropriately as a trait bound
fn byte_counter<T>(arg: T) -> usize { fn byte_counter<T>(arg: T) -> usize {