[devhelp] docs: add the version since the functions are deprecated

[Sébastien Wilmet <swilmet src gnome org>]

commit 8f1bfc3bcedd81c26d3d75cc7fa3d88e40add6fa
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sat Apr 29 15:37:46 2017 +0200

    docs: add the version since the functions are deprecated

 src/dh-book.c |    4 ++--
 src/dh-link.c |    2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/dh-book.c b/src/dh-book.c
index cd34d5f..5ab53c8 100644
--- a/src/dh-book.c
+++ b/src/dh-book.c
@@ -577,7 +577,7 @@ dh_book_cmp_by_path (DhBook *a,
  *
  * Returns: an integer less than, equal to, or greater than zero, if the path of
  * @a is <, == or > than @b_path.
- * Deprecated: Use dh_book_cmp_by_path() instead.
+ * Deprecated: 3.18: Use dh_book_cmp_by_path() instead.
  */
 gint
 dh_book_cmp_by_path_str (DhBook      *a,
@@ -631,7 +631,7 @@ dh_book_cmp_by_name (DhBook *a,
  *
  * Returns: an integer less than, equal to, or greater than zero, if the name of
  * @a is <, == or > than @b_name.
- * Deprecated: Use dh_book_cmp_by_name() instead.
+ * Deprecated: 3.18: Use dh_book_cmp_by_name() instead.
  */
 gint
 dh_book_cmp_by_name_str (DhBook      *a,
diff --git a/src/dh-link.c b/src/dh-link.c
index 3ec85be..547af54 100644
--- a/src/dh-link.c
+++ b/src/dh-link.c
@@ -251,7 +251,7 @@ dh_link_get_book_name (DhLink *link)
  * @link: a #DhLink.
  *
  * Returns: the name of the page that the @link is contained in.
- * Deprecated: this function is used nowhere.
+ * Deprecated: 3.26: This function is used nowhere.
  */
 const gchar *
 dh_link_get_page_name (DhLink *link)