docs: prefer shorter demo

src/popover/README.md

@@ -34,10 +34,7 @@ export default {
       { text: 'Option 2' },
       { text: 'Option 3' },
     ];
-
-    const onSelect = (action) => {
-      Toast(action.text);
-    };
+    const onSelect = (action) => Toast(action.text);
 
     return {
       actions,

src/popover/README.zh-CN.md

@@ -42,10 +42,7 @@ export default {
       { text: '选项二' },
       { text: '选项三' },
     ];
-
-    const onSelect = (action) => {
-      Toast(action.text);
-    };
+    const onSelect = (action) => Toast(action.text);
 
     return {
       actions,

src/popover/demo/index.vue

@@ -212,9 +212,7 @@ export default {
       });
     };
 
-    const onSelect = (action: { text: string }) => {
-      Toast(action.text);
-    };
+    const onSelect = (action: { text: string }) => Toast(action.text);
 
     return {
       ...toRefs(state),