Update GUIDE.md

Author: spinn

GUIDE.md

@@ -64,19 +64,19 @@
     * can be either a raw HTML string or a render function
     * if passing a render function, it needs to have `h` as the first argument, eg.:    
 
-    ```js
+      ```js
       content: function(h) {
         return <div> ... </div>
       }
-    ```
+      ```
   * `required` - is field required or not (true/false - default is false)
     * turn on/off the `required` asterisk next to the question in vue-form/src/assets/css/common.css:    
-    
-    ```css
+
+      ```css
       .f-required {
         display: inline; /* or display: none; to turn off */
       }     
-    ```    
+      ```    
   * `options` - `ChoiceOption` array (used only with Dropdown and MultipleChoice)
     * `ChoiceOption` must have a `label` defined (this is what will be shown to the user)
     * if `value` is not defined, `label` will be used
@@ -116,11 +116,11 @@
 * `submit` - when the default "submit" button is clicked - if you override the default `completeButton` slot, this event won't be called
 (example in Example.vue)    
 
-```js
-function onSubmit(questionList) {
-  // Handle submit event. 
-}
-```
+  ```js
+  function onSubmit(questionList) {
+    // Handle submit event. 
+  }
+  ```
 
 ## Survey component slots: