Update Modal doc, relevant:https://github.com/ant-design/ant-design/pull/7085

components/modal/index.en-US.md

@@ -43,7 +43,7 @@ and so on.
 > <Modal key={this.state.newKey} visible={this.state.visible} />
 > ```
 
-> Another way is to conditionally mount modal
+> Another way is to conditionally mount modal.
 
 > ```jsx
 > {this.state.visible && <Modal visible={true} />}

components/modal/index.zh-CN.md

@@ -42,6 +42,12 @@ title: Modal
 > <Modal key={this.state.newKey} visible={this.state.visible} />
 > ```
 
+> 另一种方式是根据条件加载 Modal。
+
+> ```jsx
+> {this.state.visible && <Modal visible={true} />}
+> ```
+
 ### Modal.method()
 
 包括：