[css-backgrounds-4] Moved definition for animating shadows to 'box-shadow-offset'

Author: SebastianZ

css-backgrounds-4/Overview.bs

@@ -773,7 +773,11 @@ Inherited: no
 Percentages: N/A
 Computed value: list, each item either 'none' or a pair of offsets
   (horizontal and vertical) from the element‘s box
-Animatable: by computed value
+Animatable: by computed value,
+    appending blank shadows (''transparent 0 0 0 0'')
+    with a corresponding ''box-shadow-position/inset'' keyword as needed
+    to match the longer list
+    if the shorter list is otherwise compatible with the longer one
 </pre>
 
 <p>The 'box-shadow-offset' property defines one or more drop shadow offsets.
@@ -904,11 +908,7 @@ Applies to: all elements
 Inherited: no
 Percentages: N/A
 Computed value: see individual properties
-Animatable: by computed value,
-    appending blank shadows (''transparent 0 0 0 0'')
-    with a corresponding ''box-shadow-position/inset'' keyword as needed
-    to match the longer list
-    if the shorter list is otherwise compatible with the longer one
+Animatable: see individual properties
 </pre>
 
   <p>The 'box-shadow' property attaches one or more drop-shadows to the box.