[libhandy] swipeable: Add warnings to all signal docs

[Adrien Plazas <aplazas src gnome org>]

commit 9b4e1dd6905da880be42574d617026fece86e450
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Mon Jun 15 08:51:02 2020 +0500

    swipeable: Add warnings to all signal docs
    
    Signed-off-by: Alexander Mikhaylenko <alexm gnome org>

 src/hdy-swipeable.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/src/hdy-swipeable.c b/src/hdy-swipeable.c
index da05e751..9c8399d5 100644
--- a/src/hdy-swipeable.c
+++ b/src/hdy-swipeable.c
@@ -47,6 +47,8 @@ hdy_swipeable_default_init (HdySwipeableInterface *iface)
    *
    * @duration can be 0 if the child is switched without animation.
    *
+   * This is used by #HdySwipeGroup, applications should not connect to it.
+   *
    * Since: 1.0
    */
   signals[SIGNAL_CHILD_SWITCHED] =
@@ -69,6 +71,8 @@ hdy_swipeable_default_init (HdySwipeableInterface *iface)
    * The @direction value can be used to restrict the swipe to a certain
    * direction.
    *
+   * This is used by #HdySwipeGroup, applications should not connect to it.
+   *
    * Since: 1.0
    */
   signals[SIGNAL_SWIPE_BEGAN] =