update readme and example again

Author: jtsternberg

README.md

@@ -9,10 +9,10 @@ If the ability to search for a post and attach it is more in line with what you
 
 ## Installation
 
-Follow the example in `example-field-setup.php` for a demonstration. The example assumes you have both CMB2 and this extension in your mu-plugins directory. If you're using CMB2 installed as a plugin, remove [line 6 of the example](https://github.com/WebDevStudios/cmb2-attached-posts/blob/master/example-field-setup.php#L6).
+Follow the example in [`example-field-setup.php`](https://github.com/WebDevStudios/cmb2-attached-posts/blob/master/example-field-setup.php) for a demonstration. The example assumes you have both CMB2 and this extension in your mu-plugins directory. If you're using CMB2 installed as a plugin, remove [lines 6-9 of the example](https://github.com/WebDevStudios/cmb2-attached-posts/blob/master/example-field-setup.php#L6-L9).
 
 ## Customization
-In the example file `example-field-setup.php`, the field is added using the prefix `_attached_cmb2_` and the name `attached_posts` which results in a meta key of `_attached_cmb2_attached_posts`. The example also demonstrates how to modify the `get_posts` query args.
+The example demonstrates how to modify the `get_posts` query args, and allows you to toggle the thumbnails display as well as a filter search input.
 
 ## Usage
 You can retrieve the meta data using the following:

example-field-setup.php

@@ -20,9 +20,6 @@
  */
 function cmb2_attached_posts_field_metaboxes_example() {
 
-	// Start with an underscore to hide fields from custom fields list
-	$prefix = '_attached_cmb2_';
-
 	$example_meta = new_cmb2_box( array(
 		'id'           => 'cmb2_attached_posts_field',
 		'title'        => __( 'Attached Posts', 'cmb2' ),
@@ -35,7 +32,7 @@ function cmb2_attached_posts_field_metaboxes_example() {
 	$example_meta->add_field( array(
 		'name'    => __( 'Attached Posts', 'cmb2' ),
 		'desc'    => __( 'Drag posts from the left column to the right column to attach them to this page.<br />You may rearrange the order of the posts in the right column by dragging and dropping.', 'cmb2' ),
-		'id'      => $prefix . 'attached_posts',
+		'id'      => 'attached_cmb2_attached_posts',
 		'type'    => 'custom_attached_posts',
 		'options' => array(
 			'show_thumbnails' => true, // Show thumbnails on the left