chore(iterators5): Minor formatting improvements.

exercises/standard_library_types/iterators5.rs

@@ -1,14 +1,12 @@
 // iterators5.rs
-
 // Let's define a simple model to track Rustlings exercise progress. Progress
 // will be modelled using a hash map. The name of the exercise is the key and
 // the progress is the value. Two counting functions were created to count the
 // number of exercises with a given progress. These counting functions use
 // imperative style for loops. Recreate this counting functionality using
 // iterators. Only the two iterator methods (count_iterator and
 // count_collection_iterator) need to be modified.
-// Execute `rustlings hint
-// iterators5` for hints.
+// Execute `rustlings hint iterators5` for hints.
 //
 // Make the code compile and the tests pass.