Luhn trait: update rust book url (#2014)

0xwetzo · web-flow · commit 0b6eb4fae96d · 2025-02-10T19:03:35.000+01:00
Current rust book url is no longer valid. Updated with the active url of
the trait page.
diff --git a/exercises/practice/luhn-trait/.docs/instructions.md b/exercises/practice/luhn-trait/.docs/instructions.md
@@ -20,4 +20,4 @@ In "Luhn: Using the From Trait" you implemented a From trait, which also require
 
 Instead of creating a Struct just to perform the validation, what if you validated the primitives (i.e, String, u8, etc.) themselves?
 
-In this exercise you'll create and implement a custom [trait](https://doc.rust-lang.org/book/2018-edition/ch10-02-traits.html) that performs the validation.
+In this exercise you'll create and implement a custom [trait](https://doc.rust-lang.org/book/ch10-02-traits.html) that performs the validation.

Original file line number	Diff line number	Diff line change
`@@ -20,4 +20,4 @@ In "Luhn: Using the From Trait" you implemented a From trait, which also require`
`20`	`20`
`21`	`21`	`Instead of creating a Struct just to perform the validation, what if you validated the primitives (i.e, String, u8, etc.) themselves?`
`22`	`22`
`23`		`-In this exercise you'll create and implement a custom [trait](https://doc.rust-lang.org/book/2018-edition/ch10-02-traits.html) that performs the validation.`
	`23`	`+In this exercise you'll create and implement a custom [trait](https://doc.rust-lang.org/book/ch10-02-traits.html) that performs the validation.`