Clarify distinction between for iter and into_iter

src/flow_control/for.md

@@ -67,17 +67,20 @@ fn main() {
     for name in names.iter() {
         match name {
             &"Ferris" => println!("There is a rustacean among us!"),
+            // TODO ^ Try deleting the & and matching just "Ferris"
             _ => println!("Hello {}", name),
         }
     }
+
+    println!("names: {:?}", names);
 }
 ```
 
 * `into_iter` - This consumes the collection so that on each iteration the exact
   data is provided. Once the collection has been consumed it is no longer
   available for reuse as it has been 'moved' within the loop.
 
-```rust, editable
+```rust, editable, ignore
 fn main() {
     let names = vec!["Bob", "Frank", "Ferris"];
 
@@ -87,6 +90,9 @@ fn main() {
             _ => println!("Hello {}", name),
         }
     }
+
+    println!("names: {:?}", names);
+    // FIXME ^ Comment out this line
 }
 ```