Add a missing Oxford comma on Export screen.

Props juhise.
Fixes #33906.
Built from https://develop.svn.wordpress.org/trunk@34249


git-svn-id: http://core.svn.wordpress.org/trunk@34213 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/export.php

@@ -153,7 +153,7 @@ function export_date_options( $post_type = 'post' ) {
 <form method="get" id="export-filters">
 <input type="hidden" name="download" value="true" />
 <p><label><input type="radio" name="content" value="all" checked="checked" /> <?php _e( 'All content' ); ?></label></p>
-<p class="description"><?php _e( 'This will contain all of your posts, pages, comments, custom fields, terms, navigation menus and custom posts.' ); ?></p>
+<p class="description"><?php _e( 'This will contain all of your posts, pages, comments, custom fields, terms, navigation menus, and custom posts.' ); ?></p>
 
 <p><label><input type="radio" name="content" value="posts" /> <?php _e( 'Posts' ); ?></label></p>
 <ul id="post-filters" class="export-filters">

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34248';
+$wp_version = '4.4-alpha-34249';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.