Remove validity behavior that's in conflict with DOM spec definition

Author: dandclark

css-highlight-api-1/Overview.bs

@@ -510,9 +510,6 @@ Range Updating and Invalidation</h3>
 	if any {{StaticRange}} in the [=highlight registry=] associated with that document's window
 	is not <a spec=dom for="StaticRange">valid</a>,
 	the user agent must ignore that [=range=].
-	If the [=start offset=] or [=end offset=] of any [=range=]
-	are greater than the corresponding node’s <a spec=dom>length</a>,
-	The user agent must behave as if it was equal to that <a spec=dom>length</a>.
 
 	Issue(4598): The interaction of {{StaticRange}}s in a [=custom highlight=]
 	and [[css-contain-2]]