[cssom-view] Fix scrollend event on document.

As per the comments in #12606.

Author: emilio

cssom-view-1/Overview.bs

@@ -2352,7 +2352,7 @@ Issue: In what order are scrollend events dispatched? Ordered based on scroll st
     in the order they were added to the list, run these substeps:
 
     1. If <var>target</var> is a {{Document}}, and <var>type</var> is <code>"scroll"</code> or <code>"scrollend"</code>,
-        <a>fire an event</a> named <a event>scroll</a> that bubbles at <var>target</var>.
+        <a>fire an event</a> named <var>type</var> that bubbles at <var>target</var>.
     1. Otherwise, if <var>type</var> is <code>"scrollsnapchange"</code>, then:
       1. Let |blockTarget| and |inlineTarget| be null initially.
       1. If the <a>scrollsnapchangeTargetBlock</a> associated with <var>target</var> is a pseudo-element,
@@ -2622,4 +2622,4 @@ the Windows Internet Explorer browser.
     scroll-behavior-smooth.html
     scroll-behavior-subframe-root.html
     scroll-behavior-subframe-window.html
-</wpt>
+</wpt>