[devhelp] BookList: improve doc of get_books()

[Sébastien Wilmet <swilmet src gnome org>]

commit 7477ff2dd9c49c805557f62b8c41a3d2d7f64981
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Apr 27 13:20:02 2018 +0200

    BookList: improve doc of get_books()

 devhelp/dh-book-list.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/devhelp/dh-book-list.c b/devhelp/dh-book-list.c
index eb24276..6012afb 100644
--- a/devhelp/dh-book-list.c
+++ b/devhelp/dh-book-list.c
@@ -168,8 +168,8 @@ dh_book_list_init (DhBookList *book_list)
  * dh_book_list_get_books:
  * @book_list: a #DhBookList.
  *
- * Gets the list of #DhBook's part of @book_list. Each book ID in the list is
- * unique (see dh_book_get_id()).
+ * Gets the list of #DhBook's part of @book_list, in no particular order. Each
+ * book ID in the list is unique (see dh_book_get_id()).
  *
  * Returns: (transfer none) (element-type DhBook): the #GList of #DhBook's part
  * of @book_list.