Add inline documentation of the default arguments for `wp_list_pages()`.

Props garza for the initial patches.
Fixes #11338.

Built from https://develop.svn.wordpress.org/trunk@28357


git-svn-id: http://core.svn.wordpress.org/trunk@28185 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/post-template.php

@@ -966,10 +966,37 @@ function wp_dropdown_pages($args = '') {
  *
  * @since 1.5.0
  *
- * @param array|string $args Optional. Override default arguments.
+ * @see get_pages()
- * @return string HTML content, if not displaying.
+ *
+ * @param array|string $args {
+ *     Array or string of arguments. Optional.
+ *
+ *     @type int    $child_of     Display only the sub-pages of a single page by ID. Default 0 (all pages).
+ *     @type string $authors      Comma-separated list of author IDs. Default empty (all authors).
+ *     @type string $date_format  PHP date format to use for the listed pages. Relies on the 'show_date' parameter.
+ *                                Default is the value of 'date_format' option.
+ *     @type int    $depth        Number of levels in the hierarchy of pages to include in the generated list.
+ *                                Accepts -1 (any depth), 0 (all pages), 1 (top-level pages only), and n (pages to
+ *                                the given n depth). Default 0.
+ *     @type bool   $echo         Whether or not to echo the list of pages. Default true.
+ *     @type string $exclude      Comma-separated list of page IDs to exclude. Default empty.
+ *     @type array  $include      Comma-separated list of page IDs to include. Default empty.
+ *     @type string $link_after   Text or HTML to follow the page link label. Default null.
+ *     @type string $link_before  Text or HTML to precede the page link label. Default null.
+ *     @type string $post_type    Post type to query for. Default 'page'.
+ *     @type string $post_status  Comma-separated list of post statuses to include. Default 'publish'.
+ *     @type string $show_date	  Whether to display the page publish or modified date for each page. Accepts
+ *                                'modified' or any other value. An empty value hides the date. Default empty.
+ *     @type string $sort_column  Comma-separated list of column names to sort the pages by. Accepts 'post_author',
+ *                                'post_date', 'post_title', 'post_name', 'post_modified', 'post_modified_gmt',
+ *                                'menu_order', 'post_parent', 'ID', 'rand', or 'comment_count'. Default 'post_title'.
+ *     @type string $title_li     List heading. Passing a null or empty value will result in no heading, and the list
+ *                                will not be wrapped with unordered list `<ul>` tags. Default 'Pages'.
+ *     @type Walker $walker       Walker instance to use for listing pages. Default empty (Walker_Page).
+ * }
+ * @return string HTML list of pages.
  */
-function wp_list_pages($args = '') {
+function wp_list_pages( $args = '' ) {
 	$defaults = array(
 		'depth' => 0, 'show_date' => '',
 		'date_format' => get_option('date_format'),