minor grammatical issue

Author: howcom

css3-multicol/Overview.src.html

@@ -1256,6 +1256,7 @@ <h3>'column-span'</h3>
 <dl>
 
 <dt>none
+
 <dd>The element does not span multiple columns.
 
 <dt>all
@@ -1444,7 +1445,7 @@ <h3>Overflow inside multicol elements</h3>
 <h3>Pagination and overflow outside multicol elements</h3>
 
 <p>Content and column rules that extend outside column boxes at
-the edges of the multi-column element is clipped according to the
+the edges of the multi-column element are clipped according to the
 'overflow' property.
 
 <p>A multicol element can have more columns than it has room for due to: