[tepl] ApplicationWindow: improve the doc about TeplTabGroup

[Sébastien Wilmet <swilmet src gnome org>]

commit 48cf76cd28a0bdc584a32a3ebb469f00cce8bbe5
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sat Jun 24 17:39:30 2017 +0200

    ApplicationWindow: improve the doc about TeplTabGroup

 tepl/tepl-application-window.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/tepl/tepl-application-window.c b/tepl/tepl-application-window.c
index 8f197ed..763dced 100644
--- a/tepl/tepl-application-window.c
+++ b/tepl/tepl-application-window.c
@@ -35,6 +35,9 @@
  *
  * #TeplApplicationWindow extends the #GtkApplicationWindow class.
  *
+ * An application needs to call tepl_application_window_set_tab_group() to
+ * benefit from the #TeplTabGroup interface implemented by this class.
+ *
  * Note that #TeplApplicationWindow extends the #GtkApplicationWindow class but
  * without subclassing it, because several libraries might want to extend
  * #GtkApplicationWindow and an application needs to be able to use all those
@@ -273,9 +276,9 @@ tepl_application_window_get_application_window (TeplApplicationWindow *tepl_wind
  * @tepl_window: a #TeplApplicationWindow.
  * @tab_group: a #TeplTabGroup.
  *
- * Sets the #TeplTabGroup of @tepl_window. This function can be called only once,
- * it is not possible to change the #TeplTabGroup (this restriction may be lifted
- * in the future if there is a compelling use-case).
+ * Sets the #TeplTabGroup of @tepl_window. This function can be called only
+ * once, it is not possible to change the #TeplTabGroup afterwards (this
+ * restriction may be lifted in the future if there is a compelling use-case).
  *
  * #TeplApplicationWindow implements the #TeplTabGroup interface by delegating
  * the requests to @tab_group.