Fix incomplete/incorrect edit

Part of w3c#10435

Author: frivoal

css-overflow-4/Overview.bs

@@ -1129,8 +1129,8 @@ Fragmentation of Overflow: the 'continue' property</h3>
 		the [=computed value=] is becomes ''flow-root'' and
 		the box establishes a [=BFC=].
 	* If the [=specified value=] of the 'display property is ''-webkit-inline-box'',
-		the [=computed value=] is becomes ''flow-root'' and
-		the box establishes a [=BFC=] as if it had been ''inline-block''.
+		the [=computed value=] is becomes ''inline-block'' and
+		the box establishes a [=BFC=].
 
 	Note: This means that 'line-clamp' will work
 	if both or neither of ''-webkit-box-orient: vertical''