Merge pull request chai2010#333 from orangle/patch-1

fix ch1-03

Author: chai2010

ch1-basic/ch1-03-array-string-and-slice.md

@@ -54,13 +54,13 @@ for i, v := range b {     // 通过数组指针迭代数组的元素
 
 ```go
 	for i := range a {
-		fmt.Printf("b[%d]: %d\n", i, b[i])
+		fmt.Printf("a[%d]: %d\n", i, a[i])
 	}
 	for i, v := range b {
 		fmt.Printf("b[%d]: %d\n", i, v)
 	}
 	for i := 0; i < len(c); i++ {
-		fmt.Printf("b[%d]: %d\n", i, b[i])
+		fmt.Printf("c[%d]: %d\n", i, c[i])
 	}
 ```
 
@@ -395,13 +395,13 @@ var (
 
 ```go
 	for i := range a {
-		fmt.Printf("b[%d]: %d\n", i, a[i])
+		fmt.Printf("a[%d]: %d\n", i, a[i])
 	}
 	for i, v := range b {
 		fmt.Printf("b[%d]: %d\n", i, v)
 	}
 	for i := 0; i < len(c); i++ {
-		fmt.Printf("b[%d]: %d\n", i, c[i])
+		fmt.Printf("c[%d]: %d\n", i, c[i])
 	}
 ```