Update description of NotifyCollectionChangedAction.Reset, Closes #3253 (#3325)

Author: marcelwgn

xml/System.Collections.Specialized/NotifyCollectionChangedAction.xml

@@ -242,7 +242,7 @@
       </ReturnValue>
       <MemberValue>4</MemberValue>
       <Docs>
-        <summary>The content of the collection was cleared.</summary>
+        <summary>The contents of the collection changed dramatically.</summary>
       </Docs>
     </Member>
   </Members>