update book code

eBook/exercises/chapter_4/local_scope.go

@@ -1,17 +1,17 @@
-package main
-
-var a = "G"   // global (package) scope
-
-func main() {
-	n()
-	m()
-	n()
-}
-func n() {
-	print(a)
-}
-func m() {
-	a := "O"  // new local variable a is declared
-	print(a)
-}
+package main
+
+var a = "G"   // global (package) scope
+
+func main() {
+	n()
+	m()
+	n()
+}
+func n() {
+	print(a)
+}
+func m() {
+	a := "O"  // new local variable a is declared
+	print(a)
+}
 // GOG