clarifying doc.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@10364 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/model/Hudson.java

@@ -1119,6 +1119,11 @@ public final class Hudson extends View implements ItemGroup<TopLevelItem>, Node,
         return null;
     }
 
+    /**
+     * {@inheritDoc}.
+     *
+     * Note that the look up is case-insensitive.
+     */
     @Override
     public TopLevelItem getItem(String name) {
         return items.get(name);