perf[v-permission]: refine v-permission demo

src/lang/en.js

@@ -87,7 +87,8 @@ export default {
   },
   permission: {
     roles: 'Your roles',
-    switchRoles: 'Switch roles'
+    switchRoles: 'Switch roles',
+    tips: 'In some cases it is not suitable to use v-permission, such as element Tab component or el-table-column and other asynchronous rendering dom cases which can only be achieved by manually setting the v-if.'
   },
   guide: {
     description: 'The guide page is useful for some people who entered the project for the first time. You can briefly introduce the features of the project. Demo is based on ',

src/lang/es.js

@@ -87,7 +87,8 @@ export default {
   },
   permission: {
     roles: 'Tus permisos',
-    switchRoles: 'Cambiar permisos'
+    switchRoles: 'Cambiar permisos',
+    tips: 'In some cases it is not suitable to use v-permission, such as element Tab component or el-table-column and other asynchronous rendering dom cases which can only be achieved by manually setting the v-if.'
   },
   guide: {
     description: 'The guide page is useful for some people who entered the project for the first time. You can briefly introduce the features of the project. Demo is based on ',

src/lang/zh.js

@@ -87,7 +87,8 @@ export default {
   },
   permission: {
     roles: '你的权限',
-    switchRoles: '切换权限'
+    switchRoles: '切换权限',
+    tips: '在某些情况下，不适合使用 v-permission。例如：Element-UI 的 Tab 组件或 el-table-column 以及其它动态渲染 dom 的场景。你只能通过手动设置 v-if 来实现。'
   },
   guide: {
     description: '引导页对于一些第一次进入项目的人很有用，你可以简单介绍下项目的功能。本 Demo 是基于',