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Update ch17-03-oo-design-patterns.md

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@ -73,7 +73,7 @@ impl State for Draft {}
当我们创建一个新的`Post`实例时, 我们把它的`state`字段设为一个`Some`类型的值, 该值持有指向一个新的`Draft`结构实例的`Box`. 这就确保无论何时我们创建一个`Post`类型的新实例时, 它总是处于草稿状态. 因为`Post`的`state`字段是私有的, 除了调用`new`无法创建一个处于其它状态的`Post`!
### Storing the Text of the Post Content
### 存放Post的文本内容
In the `Post::new` function, we set the `content` field to a new, empty
`String`. In Listing 17-11, we showed that we want to be able to call a method