Docs: Clarify that `wp_list_pages()` and `get_pages()` only work with hierarchical post types.

Props doublehhh.
Fixes #39369.

git-svn-id: https://develop.svn.wordpress.org/trunk@40027 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/post-template.php

@@ -1126,7 +1126,7 @@ function wp_dropdown_pages( $args = '' ) {
 }
 
 /**
- * Retrieve or display list of pages in list (li) format.
+ * Retrieve or display list of pages (or hierarchical post type items) in list (li) format.
  *
  * @since 1.5.0
  * @since 4.7.0 Added the `item_spacing` argument.

src/wp-includes/post.php

@@ -4471,7 +4471,7 @@ function get_page_uri( $page = 0 ) {
 }
 
 /**
- * Retrieve a list of pages.
+ * Retrieve a list of pages (or hierarchical post type items).
  *
  * @global wpdb $wpdb WordPress database abstraction object.
  *