[cssom-view-1] Add missing value to check container against

Author: AtkinsSJ

cssom-view-1/Overview.bs

@@ -1299,7 +1299,7 @@ The <dfn method for=Element caniuse=scrollintoview>scrollIntoView(<var>arg</var>
     1. Set <var>behavior</var> to the {{ScrollOptions/behavior}} dictionary member of <var>options</var>.
     1. Set <var>block</var> to the {{ScrollIntoViewOptions/block}} dictionary member of <var>options</var>.
     1. Set <var>inline</var> to the {{ScrollIntoViewOptions/inline}} dictionary member of <var>options</var>.
-    1. If the {{ScrollIntoViewOptions/container}} dictionary member of <var>options</var>,
+    1. If the {{ScrollIntoViewOptions/container}} dictionary member of <var>options</var> is "nearest",
         set <var>container</var> to this element.
 1. Otherwise, if <var>arg</var> is false, then set <var>block</var> to "<code>end</code>".
 1. If the element does not have any associated [=CSS/box=],