chore: fix comment in enums3.rs

exercises/enums/enums3.rs

@@ -41,10 +41,9 @@ impl State {
     }
 
     fn process(&mut self, message: Message) {
-        // TODO: create a match expression to process the different message
-        // variants
-        // Remember: When passing a tuple as a function argument, you'll need
-        // extra parentheses: fn function((t, u, p, l, e))
+        // TODO: create a match expression to process the different message variants
+        // Remember: When passing a tuple as a function argument, you'll need extra parentheses:
+        // fn function((t, u, p, l, e))
     }
 }