fix[ErrorLog]: fixed error log dialog z-index bug (#1844)

https://github.com/PanJiaChen/vue-element-admin/issues/1830

src/components/ErrorLog/index.vue

@@ -6,7 +6,7 @@
       </el-button>
     </el-badge>
 
-    <el-dialog :visible.sync="dialogTableVisible" title="Error Log" width="80%">
+    <el-dialog :visible.sync="dialogTableVisible" title="Error Log" width="80%" append-to-body>
       <el-table :data="errorLogs" border>
         <el-table-column label="Message">
           <template slot-scope="{row}">

src/settings.js

@@ -28,10 +28,10 @@ export default {
   sidebarLogo: false,
 
   /**
-   * @type {string | array} 'production' | ['production','development']
+   * @type {string | array} 'production' | ['production', 'development']
    * @description Need show err logs component.
    * The default is only used in the production env
-   * If you want to also use it in dev, you can pass ['production','development']
+   * If you want to also use it in dev, you can pass ['production', 'development']
    */
   errorLog: 'production'
 }