Update der Doku fuer 3.6.4 + LWO

... aus den Driversourcen 3.6.4 + LWO

Change-Id: I9226bb373436d5b05828f89c7da26df39aa45af7
diff --git a/doc/efun/variable_exists b/doc/efun/variable_exists
index 65337e5..682490e 100644
--- a/doc/efun/variable_exists
+++ b/doc/efun/variable_exists
@@ -2,7 +2,7 @@
         #include <functionlist.h>
 
         string variable_exists(string str [, int flags])
-        string variable_exists(string str, object obj [, int flags])
+        string variable_exists(string str, object|lwobject obj [, int flags])
 
 BESCHREIBUNG
         Sucht eine Varialbe <str> in this_object() oder (falls angegeben)