Fix bad calendar tag.

Broken by 21081.
bug=2061105
diff --git a/src/com/google/wireless/gdata/calendar/serializer/xml/XmlEventEntryGDataSerializer.java b/src/com/google/wireless/gdata/calendar/serializer/xml/XmlEventEntryGDataSerializer.java
index e52277c..6b04261 100644
--- a/src/com/google/wireless/gdata/calendar/serializer/xml/XmlEventEntryGDataSerializer.java
+++ b/src/com/google/wireless/gdata/calendar/serializer/xml/XmlEventEntryGDataSerializer.java
@@ -213,7 +213,7 @@
 	throws IOException {
 	serializer.startTag(NAMESPACE_GCAL_URI, "guestsCanModify");
 	serializer.attribute(null /* ns */, "value", guestsCanModify ? "true" : "false");
-	serializer.endTag(NAMESPACE_GCAL_URI, "sendEventNotifications");
+	serializer.endTag(NAMESPACE_GCAL_URI, "guestsCanModify");
     }
 
     private static void serializeGuestsCanInviteOthers(XmlSerializer serializer,