docs: prefer shorter demo

src/action-sheet/README.md

@@ -71,9 +71,7 @@ export default {
       { name: 'Option 2' },
       { name: 'Option 3' },
     ];
-    const onCancel = () => {
-      Toast('cancel');
-    };
+    const onCancel = () => Toast('cancel');
 
     return {
       show,

src/action-sheet/README.zh-CN.md

@@ -79,9 +79,7 @@ export default {
       { name: '选项二' },
       { name: '选项三' },
     ];
-    const onCancel = () => {
-      Toast('取消');
-    };
+    const onCancel = () => Toast('取消');
 
     return {
       show,

src/action-sheet/demo/index.vue

@@ -122,10 +122,7 @@ export default {
       state.show.basic = false;
       Toast(item.name);
     };
-
-    const onCancel = () => {
-      Toast(t('cancel'));
-    };
+    const onCancel = () => Toast(t('cancel'));
 
     return {
       ...toRefs(state),