feat: remove collections to hashmaps

exercises/hashmaps/hashmaps1.rs

@@ -1,4 +1,4 @@
-// hashmap1.rs
+// 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
@@ -8,7 +8,7 @@
 //
 // Make me compile and pass the tests!
 //
-// Execute the command `rustlings hint hashmap1` if you need
+// Execute the command `rustlings hint hashmaps1` if you need
 // hints.
 
 // I AM NOT DONE

exercises/hashmaps/hashmaps2.rs

@@ -1,4 +1,4 @@
-// hashmap2.rs
+// hashmaps2.rs
 
 // A basket of fruits in the form of a hash map is given. The key
 // represents the name of the fruit and the value represents how many
@@ -9,7 +9,7 @@
 //
 // Make me pass the tests!
 //
-// Execute the command `rustlings hint hashmap2` if you need
+// Execute the command `rustlings hint hashmaps2` if you need
 // hints.
 
 // I AM NOT DONE