change to iterate over &vet

FuGangqiang · FuGangqiang · commit 69bfb6f717b9 · 2015-02-28T09:59:52.000+08:00
diff --git a/src/doc/intro.md b/src/doc/intro.md
@@ -565,7 +565,7 @@ while retaining safety. The answer is iterators:
 ```{rust}
 let vec = vec![1, 2, 3];
 
-for x in vec {
+for x in &vec {
     println!("{}", x);
 }
 ```

Original file line number	Diff line number	Diff line change
`@@ -565,7 +565,7 @@ while retaining safety. The answer is iterators:`
`565`	`565`	```{rust}
`566`	`566`	`let vec = vec![1, 2, 3];`
`567`	`567`
`568`		`-for x in vec {`
	`568`	`+for x in &vec {`
`569`	`569`	`println!("{}", x);`
`570`	`570`	`}`
`571`	`571`	```