[css-contain] Remove 'text-overflow' from paint-containment optimizations

Author: Psychpsyo

css-contain-1/Overview.bs

@@ -1099,7 +1099,7 @@ Possible Paint-Containment Optimizations</h4>
 		and could otherwise be skipped.
 
 	2. Unless the clipped content is made accessible via a separate mechanism
-		such as the 'overflow', 'resize', or 'text-overflow' properties,
+		such as the 'overflow' or 'resize' properties,
 		the UA can reserve "canvas" space for the box exactly the box's size.
 		(In similar, scrollable, situations, like ''overflow: hidden'',
 		it's possible to scroll to the currently-clipped content,

css-contain-2/Overview.bs

@@ -1535,7 +1535,7 @@ Possible Paint-Containment Optimizations</h4>
 		and could otherwise be skipped.
 
 	2. Unless the clipped content is made accessible via a separate mechanism
-		such as the 'overflow', 'resize', or 'text-overflow' properties,
+		such as the 'overflow' or 'resize' properties,
 		the UA can reserve "canvas" space for the box exactly the box's size.
 		(In similar, scrollable, situations, like ''overflow: hidden'',
 		it's possible to scroll to the currently-clipped content,