docs: cleanup the explanation paragraphs at the start of each exercise.

exercises/traits/traits1.rs

@@ -1,13 +1,11 @@
 // traits1.rs
-// Time to implement some traits!
 //
-// Your task is to implement the trait
-// `AppendBar` for the type `String`.
+// Time to implement some traits! Your task is to implement the trait
+// `AppendBar` for the type `String`. The trait AppendBar has only one function,
+// which appends "Bar" to any object implementing this trait.
 //
-// The trait AppendBar has only one function,
-// which appends "Bar" to any object
-// implementing this trait.
-// Execute `rustlings hint traits1` or use the `hint` watch subcommand for a hint.
+// Execute `rustlings hint traits1` or use the `hint` watch subcommand for a
+// hint.
 
 // I AM NOT DONE
 

exercises/traits/traits2.rs

@@ -1,14 +1,11 @@
 // traits2.rs
 //
-// Your task is to implement the trait
-// `AppendBar` for a vector of strings.
-//
-// To implement this trait, consider for
-// a moment what it means to 'append "Bar"'
+// Your task is to implement the trait `AppendBar` for a vector of strings. To
+// implement this trait, consider for a moment what it means to 'append "Bar"'
 // to a vector of strings.
 //
-// No boiler plate code this time,
-// you can do this!
+// No boiler plate code this time, you can do this!
+//
 // Execute `rustlings hint traits2` or use the `hint` watch subcommand for a hint.
 
 // I AM NOT DONE

exercises/traits/traits3.rs

@@ -1,11 +1,12 @@
 // traits3.rs
 //
-// Your task is to implement the Licensed trait for
-// both structures and have them return the same
-// information without writing the same function twice.
+// Your task is to implement the Licensed trait for both structures and have
+// them return the same information without writing the same function twice.
 //
 // Consider what you can add to the Licensed trait.
-// Execute `rustlings hint traits3` or use the `hint` watch subcommand for a hint.
+//
+// Execute `rustlings hint traits3` or use the `hint` watch subcommand for a
+// hint.
 
 // I AM NOT DONE
 

exercises/traits/traits4.rs

@@ -1,8 +1,11 @@
 // traits4.rs
 //
 // Your task is to replace the '??' sections so the code compiles.
+//
 // Don't change any line other than the marked one.
-// Execute `rustlings hint traits4` or use the `hint` watch subcommand for a hint.
+//
+// Execute `rustlings hint traits4` or use the `hint` watch subcommand for a
+// hint.
 
 // I AM NOT DONE
 

exercises/traits/traits5.rs

@@ -1,8 +1,11 @@
 // traits5.rs
 //
 // Your task is to replace the '??' sections so the code compiles.
+//
 // Don't change any line other than the marked one.
-// Execute `rustlings hint traits5` or use the `hint` watch subcommand for a hint.
+//
+// Execute `rustlings hint traits5` or use the `hint` watch subcommand for a
+// hint.
 
 // I AM NOT DONE