small docs tweak
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@ -5,6 +5,9 @@ use crate::cow::Cow;
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/// We specify `SharedString` to attempt to get the best of both worlds: flexibility to provide a
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/// static or dynamic (owned) string, while retaining the performance benefits of being able to
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/// take ownership of owned strings and borrows of completely static strings.
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///
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/// `SharedString` can be converted to from either `&'static str` or `String`, with a method,
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/// `const_str`, from constructing `SharedString` from `&'static str` in a `const` fashion.
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pub type SharedString = Cow<'static, str>;
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/// Units for a given metric.
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