[scroll-animations-1] Clarify that animation-range is reset by animation. w3c#8054

Author: fantasai

scroll-animations-1/Overview.bs

@@ -903,7 +903,8 @@ spec: cssom-view-1; type: dfn;
 	A set of animation keyframes can be attached
 	in reference to [=named timeline ranges=]
 	by restricting the animation’s [=active interval=]
-	to the specified timeline range.
+	to a specified timeline range
+	with the 'animation-range' properties.
 	Delays (see 'animation-delay')
 	are set within this restricted range,
 	constricting it further.
@@ -919,6 +920,9 @@ spec: cssom-view-1; type: dfn;
 	                         ╶┄┄┄┄┄ duration┄┄┄┄┄╴
 	</pre>
 
+	The 'animation-range' properties
+	are [=reset-only sub-properties=] of the 'animation' [=shorthand=].
+
 	ISSUE: Define application to time-driven animations.
 
 ### Specifying an Animation’s Timeline Range: the 'animation-range' shorthand ### {#animation-range}