[libhandy] doc: Warn of HdyLeaflet swiping changes

[Alexander Mikhaylenko <alexm src gnome org>]

commit 9223c346771e5652a842fc3cf8f56fefa3756757
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Thu Jul 16 13:06:37 2020 +0200

    doc: Warn of HdyLeaflet swiping changes

 doc/hdy-migrating-0-0-to-1.xml | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/doc/hdy-migrating-0-0-to-1.xml b/doc/hdy-migrating-0-0-to-1.xml
index bc96ffd7..20e4348a 100644
--- a/doc/hdy-migrating-0-0-to-1.xml
+++ b/doc/hdy-migrating-0-0-to-1.xml
@@ -167,6 +167,11 @@
         hdy_leaflet_set_homogeneous() accessors take a boolean parameter instead
         of a #HdyFold.
       </para>
+      <para>
+        On touchscreens, swiping forward with the “over” transition and swiping
+        back with the “under” transition can now only be done from the edge
+        where the upper child is.
+      </para>
       <para>
         The “over” and “under” transitions can draw their shadow on top of the
         window's transparent areas, like the rounded corners.