Fix typos in ephemeron docs.
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@ -39,9 +39,9 @@ Returns @racket[#t] if @racket[v] is a weak box, @racket[#f] otherwise.}
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An @deftech{ephemeron} @cite{Hayes97} is a generalization of a
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@tech{weak box} (see @secref["weakbox"]). Instead of just containing
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one value, an emphemeron holds two values: one that is considered the
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one value, an ephemeron holds two values: one that is considered the
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value of the ephemeron and another that is the ephemeron's key. Like
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the value in a weak box, the value in and ephemeron may be replaced by
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the value in a weak box, the value in an ephemeron may be replaced by
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@racket[#f], but when the @emph{key} is no longer reachable (except
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possibly via weak references) instead of when the value is no longer
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reachable.
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