fix #124

eBook/10.6.md

@@ -215,7 +215,7 @@ type B struct {
 
 func (b *B) change() { b.thing = 1 }
 
-func (b B) write() string { return fmt.Sprint((b)) }
+func (b B) write() string { return fmt.Sprint(b) }
 
 func main() {
 	var b1 B // b1是值