Formatter (#51)

Enforce consistent formatting use `dprint`

book/src/04_traits/00_intro.md

@@ -1,9 +1,9 @@
 # Traits
 
-In the previous chapter we covered the basics of Rust's type and ownership system.  
+In the previous chapter we covered the basics of Rust's type and ownership system.\
 It's time to dig deeper: we'll explore **traits**, Rust's take on interfaces.
 
-Once you learn about traits, you'll start seeing their fingerprints all over the place.  
+Once you learn about traits, you'll start seeing their fingerprints all over the place.\
 In fact, you've already seen traits in action throughout the previous chapter, e.g. `.into()` invocations as well
 as operators like `==` and `+`.
 
@@ -16,9 +16,9 @@ On top of traits as a concept, we'll also cover some of the key traits that are
 - `Sized`, to mark types with a known size
 - `Drop`, for custom cleanup logic
 
-Since we'll be talking about conversions, we'll seize the opportunity to plug some of the "knowledge gaps" 
+Since we'll be talking about conversions, we'll seize the opportunity to plug some of the "knowledge gaps"
 from the previous chapter—e.g. what is `"A title"`, exactly? Time to learn more about slices too!
 
 ## References
 
-- The exercise for this section is located in `exercises/04_traits/00_intro`
+- The exercise for this section is located in `exercises/04_traits/00_intro`