Update the class option docs.

Author: wenzhixin

docs/docs.js

@@ -238,7 +238,7 @@ $(function () {
                 {field: 'name', title: 'Name', align: 'center', valign: 'middle', width: 60, sortable: true},
                 {field: 'attribute', title: 'Attribute', align: 'center', valign: 'middle'},
                 {field: 'type', title: 'Type', align: 'center', valign: 'middle', width: 60},
-                {field: 'description', title: 'Description', width: 400},
+                {field: 'description', title: 'Description', valign: 'middle', width: 400},
                 {field: 'default', title: 'Default', align: 'right', valign: 'middle', width: 180}
             ],
             data: [
@@ -270,6 +270,13 @@ $(function () {
                     description: 'The column title text.',
                     'default': 'undefined'
                 },
+                {
+                    name: 'class',
+                    attribute: 'class / data-class',
+                    type: 'String',
+                    description: 'The column class name.',
+                    'default': 'undefined'
+                },
                 {
                     name: 'align',
                     attribute: 'data-align',

docs/documentation.html

@@ -178,6 +178,7 @@ <h1 id="the-defaults">The Defaults:</h1>
         checkbox: false,
         field: undefined,
         title: undefined,
+        class: undefined,
         align: undefined, // left, right, center
         valign: undefined, // top, middle, bottom
         width: undefined,