docs: update style guide (#8677)

docs/markdown/style-guide.zh-CN.md

@@ -135,12 +135,14 @@ export default {
 export default {
   name: '',
 
-  mixins: [],
-
   components: {},
 
   props: {},
 
+  emits: [],
+
+  setup() {},
+
   data() {},
 
   computed: {},
@@ -151,7 +153,7 @@ export default {
 
   mounted() {},
 
-  destroyed() {},
+  unmounted() {},
 
   methods: {},
 };
@@ -190,9 +192,7 @@ export default {
 单文件组件应该总是让顶级标签的顺序保持一致，且标签之间留有空行。
 
 ```html
-<template>
-  ...
-</template>
+<template> ... </template>
 
 <script>
   /* ... */