Fix a type.

Review at http://gwt-code-reviews.appspot.com/1742803

Review by: rchandia@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@11061 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/user/src/com/google/gwt/aria/client/CommonAttributeTypes.java b/user/src/com/google/gwt/aria/client/CommonAttributeTypes.java
index d7fd13b..6287f4c 100644
--- a/user/src/com/google/gwt/aria/client/CommonAttributeTypes.java
+++ b/user/src/com/google/gwt/aria/client/CommonAttributeTypes.java
@@ -20,7 +20,7 @@
 /**
  * ARIA attributes common non primitive types as defined by the W3C specification
  * <a href="http://www.w3.org/TR/wai-aria/">W3C ARIA specification</a>.
- * Users should use the types defined in this class to get instances of {@link Tristate),
+ * Users should use the types defined in this class to get instances of {@link Tristate},
  * {@link BooleanAndUndefined}, {@link IdReference} and {@link IdReferenceList}.
  * For more details about ARIA states and properties check
  * <a href="http://www.w3.org/TR/wai-aria/states_and_properties"> Supported States and Properties