Register wiki custom post type

dtbaker.wiki-mode.php

public function register_custom_post_type() {
        $labels = array(
            'name'                => 'Wiki Pages',
            'singular_name'       => 'Wiki Page',
            'menu_name'           => 'Wiki Pages',
            'parent_item_colon'   => 'Parent Wiki Page:',
            'all_items'           => 'All Wiki Pages',
            'view_item'           => 'View Wiki Page',
            'add_new_item'        => 'Add New Wiki Page',
            'add_new'             => 'New Wiki Page',
            'edit_item'           => 'Edit Wiki Page',
            'update_item'         => 'Update Wiki Page',
            'search_items'        => 'Search wiki pages',
            'not_found'           => 'No wiki pages found',
            'not_found_in_trash'  => 'No wiki pages found in Trash',
        );

        $rewrite = array(
//            'slug'                => 'wiki', //'support/documentation-wiki', // todo: option this out.
            'slug'                => 'support/documentation-wiki', // todo: option this out.
            'with_front'          => false,
            'pages'               => true,
            'feeds'               => true,
        );

        $capabilities = array(
            'edit_post'           => 'edit_wiki_page',
            'read_post'           => 'read_wiki_page',
            'delete_post'         => 'delete_wiki_page',
            'edit_posts'             => 'edit_wiki_pages',
            'edit_others_posts'      => 'edit_others_wiki_pages',
            'publish_posts'          => 'publish_wiki_pages',
            //'read_private_posts'     => 'read_private_wiki_pages',
            'delete_posts'           => 'delete_wiki_pages',
            //'delete_private_posts'   => 'delete_private_wiki_pages',
            'delete_published_posts' => 'delete_published_wiki_pages',
            'delete_others_posts'    => 'delete_others_wiki_pages',
            //'edit_private_posts'     => 'edit_private_wiki_pages',
            'edit_published_posts'   => 'edit_published_wiki_pages',
        );

        $args = array(
            'label'               => 'wiki_page',
            'description'         => 'Wiki pages',
            'labels'              => $labels,
            'supports'            => array( 'title', 'editor', 'revisions', 'comments', 'page-attributes'),
            'taxonomies'          => array(  ),//'category', 'post_tag'
            'hierarchical'        => true,
            'public'              => true,
            'show_ui'             => true,
            'show_in_menu'        => true,
            'show_in_nav_menus'   => true,
            'show_in_admin_bar'   => true,
            'menu_position'       => 25,
            'menu_icon'           => '',
            'can_export'          => true,
            'has_archive'         => false, // important for our support/documentation-wiki slug
            'exclude_from_search' => false,
            'publicly_queryable'  => true,
            'rewrite'             => $rewrite,
            'capabilities'        => $capabilities,
        );

        register_post_type( 'wiki_page', $args );
    }