Update guide.md
Corrected singular/plural reference to enums
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@ -1149,7 +1149,7 @@ enum StringResult {
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}
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```
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Where a `StringResult` is either an `StringOK`, with the result of a computation, or an
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`ErrorReason` with a `String` explaining what caused the computation to fail. This kind of
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`ErrorReason` with a `String` explaining what caused the computation to fail. These kinds of
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`enum`s are actually very useful and are even part of the standard library.
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As you can see `enum`s with values are quite a powerful tool for data representation,
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