Merge pull request #51 from guyanbiao/modify_function_name

改正章节 6-9 的 function name

eBook/06.9.md

@@ -25,7 +25,7 @@ func main() {
 	fmt.Printf("The result is: %v\n", TwoAdder(3))
 }
 
-func Add32() func(b int) int {
+func Add2() func(b int) int {
 	return func(b int) int {
 		return b + 2
 	}