chore: added more descriptive TODOs

exercises/conversions/as_ref_mut.rs

@@ -5,21 +5,22 @@
 
 // I AM NOT DONE
 
-// Obtain the number of bytes (not characters) in the given argument
-// Add the AsRef trait appropriately as a trait bound
+// Obtain the number of bytes (not characters) in the given argument.
+// TODO: Add the AsRef trait appropriately as a trait bound.
 fn byte_counter<T>(arg: T) -> usize {
     arg.as_ref().as_bytes().len()
 }
 
-// Obtain the number of characters (not bytes) in the given argument
-// Add the AsRef trait appropriately as a trait bound
+// Obtain the number of characters (not bytes) in the given argument.
+// TODO: Add the AsRef trait appropriately as a trait bound.
 fn char_counter<T>(arg: T) -> usize {
     arg.as_ref().chars().count()
 }
 
-// Squares a number using as_mut(). Add the trait bound as is appropriate and
-// implement the function body.
+// Squares a number using as_mut().
+// TODO: Add the appropriate trait bound.
 fn num_sq<T>(arg: &mut T) {
+    // TODO: Implement the function body.
     ???
 }