[scroll-animations-1] Fix error in example

Reported by @cdoublev in w3c#8438 (comment)

Author: fantasai

scroll-animations-1/Overview.bs

@@ -950,7 +950,7 @@ spec: cssom-view-1; type: dfn;
 
 			animation-range: entry;
 			animation-range-start: entry 0%;
-			animation-range-end: exit 100%;
+			animation-range-end: entry 100%;
 
 			animation-range: 10%;
 			animation-range-start: 10%;