Update animations.rst

Clarifying language

getting_started/step_by_step/animations.rst

@@ -51,7 +51,7 @@ The logo will appear from the top of the screen.
 
 With the animation editor panel open, select the "logo" node and set the
 "Rect / Position" property to ``(118, -400)`` and press the key button next
-to the property:
+to the property to add a keyframe:
 
 .. image:: img/robisplash_anim_logo_inspector_key.png
 
@@ -61,12 +61,12 @@ The keyframe will be added in the animation player editor:
 
 .. image:: img/robisplash_anim_editor_keyframe.png
 
-Move the editor cursor to the end by clicking here:
+Move the editor cursor forward in time by clicking here:
 
 .. image:: img/robisplash_anim_editor_track_cursor.png
 
 Change the logo position to ``(118, 0)`` and add a keyframe again. With two
-keyframes, the animation happens.
+keyframes with different values, the animation happens.
 
 .. image:: img/robisplash_anim_editor_keyframe_2.png