Fix typo in Document event interface name.
#define ITF_EVENT_OBJECT "org.freedesktop.atspi.Event.Object"
#define ITF_EVENT_WINDOW "org.freedesktop.atspi.Event.Window"
-#define ITF_EVENT_DOCUMENT "org.freedekstop.atspi.Event.Document"
+#define ITF_EVENT_DOCUMENT "org.freedesktop.atspi.Event.Document"
#define ITF_EVENT_FOCUS "org.freedesktop.atspi.Event.Focus"
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