docs: prefer shorter demo

src/count-down/README.md

@@ -105,9 +105,7 @@ export default {
     const reset = () => {
       countDown.value.reset();
     };
-    const onFinish = () => {
-      Toast('Finished');
-    };
+    const onFinish = () => Toast('Finished');
 
     return {
       start,

src/count-down/README.zh-CN.md

@@ -119,9 +119,7 @@ export default {
     const reset = () => {
       countDown.value.reset();
     };
-    const onFinish = () => {
-      Toast('倒计时结束');
-    };
+    const onFinish = () => Toast('倒计时结束');
 
     return {
       start,

src/count-down/demo/index.vue

@@ -85,9 +85,7 @@ export default {
     const reset = () => {
       countDown.value.reset();
     };
-    const onFinish = () => {
-      Toast(t('finished'));
-    };
+    const onFinish = () => Toast(t('finished'));
 
     return {
       t,