Clarify instructions for creating rest pose

tutorials/animation/2d_skeletons.rst

@@ -142,12 +142,13 @@ Keep going and build the whole skeleton:
 
 .. image:: img/skel2d13.png
 
-You will notice that all bones raise an annoying warning about a missing rest
-pose. This means that it's time to set one. Go to the *skeleton* node and create
-a rest pose. This pose is the default one, you can come back to it anytime you
-want (which is very handy for animating):
+You will notice that all bones raise a warning about a missing rest pose. A rest
+pose is the default pose for a skeleton, you can come back to it anytime you want
+(which is very handy for animating). To set one click on the *skeleton* node in
+the scene tree, then click on the ``Skeleton2D`` button in the toolbar, and select
+``Overwrite Rest Pose`` from the dropdown menu.
 
-.. image:: img/skel2d14.png
+.. image:: img/skel2d14.webp
 
 The warnings will go away. If you modify the skeleton (add/remove bones) you
 will need to set the rest pose again.