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

exercises/clippy/clippy1.rs

@@ -1,10 +1,13 @@
 // clippy1.rs
-// The Clippy tool is a collection of lints to analyze your code
-// so you can catch common mistakes and improve your Rust code.
 //
-// For these exercises the code will fail to compile when there are clippy warnings
-// check clippy's suggestions from the output to solve the exercise.
-// Execute `rustlings hint clippy1` or use the `hint` watch subcommand for a hint.
+// The Clippy tool is a collection of lints to analyze your code so you can
+// catch common mistakes and improve your Rust code.
+//
+// For these exercises the code will fail to compile when there are clippy
+// warnings check clippy's suggestions from the output to solve the exercise.
+//
+// Execute `rustlings hint clippy1` or use the `hint` watch subcommand for a
+// hint.
 
 // I AM NOT DONE
 

exercises/clippy/clippy2.rs

@@ -1,5 +1,7 @@
 // clippy2.rs
-// Execute `rustlings hint clippy2` or use the `hint` watch subcommand for a hint.
+// 
+// Execute `rustlings hint clippy2` or use the `hint` watch subcommand for a
+// hint.
 
 // I AM NOT DONE
 

exercises/clippy/clippy3.rs

@@ -1,5 +1,8 @@
 // clippy3.rs
+// 
 // Here's a couple more easy Clippy fixes, so you can see its utility.
+//
+// Execute `rustlings hint clippy3` or use the `hint` watch subcommand for a hint.
 
 // I AM NOT DONE