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

exercises/hashmaps/hashmaps1.rs

@@ -1,14 +1,15 @@
 // hashmaps1.rs
-// A basket of fruits in the form of a hash map needs to be defined.
-// The key represents the name of the fruit and the value represents
-// how many of that particular fruit is in the basket. You have to put
-// at least three different types of fruits (e.g apple, banana, mango)
-// in the basket and the total count of all the fruits should be at
-// least five.
+//
+// A basket of fruits in the form of a hash map needs to be defined. The key
+// represents the name of the fruit and the value represents how many of that
+// particular fruit is in the basket. You have to put at least three different
+// types of fruits (e.g apple, banana, mango) in the basket and the total count
+// of all the fruits should be at least five.
 //
 // Make me compile and pass the tests!
 //
-// Execute `rustlings hint hashmaps1` or use the `hint` watch subcommand for a hint.
+// Execute `rustlings hint hashmaps1` or use the `hint` watch subcommand for a
+// hint.
 
 // I AM NOT DONE
 

exercises/hashmaps/hashmaps2.rs

@@ -1,17 +1,18 @@
 // hashmaps2.rs
-// We're collecting different fruits to bake a delicious fruit cake.
-// For this, we have a basket, which we'll represent in the form of a hash
-// map. The key represents the name of each fruit we collect and the value
-// represents how many of that particular fruit we have collected.
-// Three types of fruits - Apple (4), Mango (2) and Lychee (5) are already
-// in the basket hash map.
-// You must add fruit to the basket so that there is at least
-// one of each kind and more than 11 in total - we have a lot of mouths to feed.
-// You are not allowed to insert any more of these fruits!
+//
+// We're collecting different fruits to bake a delicious fruit cake. For this,
+// we have a basket, which we'll represent in the form of a hash map. The key
+// represents the name of each fruit we collect and the value represents how
+// many of that particular fruit we have collected. Three types of fruits -
+// Apple (4), Mango (2) and Lychee (5) are already in the basket hash map. You
+// must add fruit to the basket so that there is at least one of each kind and
+// more than 11 in total - we have a lot of mouths to feed. You are not allowed
+// to insert any more of these fruits!
 //
 // Make me pass the tests!
 //
-// Execute `rustlings hint hashmaps2` or use the `hint` watch subcommand for a hint.
+// Execute `rustlings hint hashmaps2` or use the `hint` watch subcommand for a
+// hint.
 
 // I AM NOT DONE
 
@@ -36,9 +37,9 @@ fn fruit_basket(basket: &mut HashMap<Fruit, u32>) {
     ];
 
     for fruit in fruit_kinds {
-        // TODO: Insert new fruits if they are not already present in the basket.
-        // Note that you are not allowed to put any type of fruit that's already
-        // present!
+        // TODO: Insert new fruits if they are not already present in the
+        // basket. Note that you are not allowed to put any type of fruit that's
+        // already present!
     }
 }
 

exercises/hashmaps/hashmaps3.rs

@@ -1,18 +1,18 @@
 // hashmaps3.rs
-
-// A list of scores (one per line) of a soccer match is given. Each line
-// is of the form :
-// <team_1_name>,<team_2_name>,<team_1_goals>,<team_2_goals>
+//
+// A list of scores (one per line) of a soccer match is given. Each line is of
+// the form : "<team_1_name>,<team_2_name>,<team_1_goals>,<team_2_goals>"
 // Example: England,France,4,2 (England scored 4 goals, France 2).
-
-// You have to build a scores table containing the name of the team, goals
-// the team scored, and goals the team conceded. One approach to build
-// the scores table is to use a Hashmap. The solution is partially
-// written to use a Hashmap, complete it to pass the test.
-
+//
+// You have to build a scores table containing the name of the team, goals the
+// team scored, and goals the team conceded. One approach to build the scores
+// table is to use a Hashmap. The solution is partially written to use a
+// Hashmap, complete it to pass the test.
+//
 // Make me pass the tests!
-
-// Execute `rustlings hint hashmaps3` or use the `hint` watch subcommand for a hint.
+//
+// Execute `rustlings hint hashmaps3` or use the `hint` watch subcommand for a
+// hint.
 
 // I AM NOT DONE