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Fix reference to supertrait syntax in 09_error_trait.md (#124) 

The [Error trait](https://rust-exercises.com/100-exercises/05_ticket_v2/09_error_trait.html?highlight=supertrait#the-error-trait) chapter states that the reader may recall the supertrait syntax from the [Sized trait](https://rust-exercises.com/100-exercises/04_traits/08_sized) chapter. Actually the syntax is introduced in the [From and Into](https://rust-exercises.com/100-exercises/04_traits/09_from) chapter instead. This PR amends the text accordingly.
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book/src/05_ticket_v2/09_error_trait.md
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@ -22,7 +22,7 @@ that implements the `Error` trait.
pub trait Error: Debug + Display {} pub trait Error: Debug + Display {}
``` ```
You might recall the `:` syntax from [the `Sized` trait](../04_traits/08_sized.md)—it's used to specify **supertraits**. You might recall the `:` syntax from [the `From` trait](../04_traits/09_from.md#supertrait--subtrait)—it's used to specify **supertraits**.
For `Error`, there are two supertraits: `Debug` and `Display`. If a type wants to implement `Error`, it must also For `Error`, there are two supertraits: `Debug` and `Display`. If a type wants to implement `Error`, it must also
implement `Debug` and `Display`. implement `Debug` and `Display`.