gitlab URL correction

Doc/Sda1/dom.xml

@@ -458,7 +458,7 @@ public interface Node {            // Node Types
       <title><xref linkend="glo_XML"/> document creation from scratch.</title>
 
       <programlisting language="java"><link
-          xlink:href="https://gitlab.mi.hdm-stuttgart.de/goik/GoikLectures/tree/master/Doc/Sda1/Ref">final Element titel</link> = new Element("titel"); <co
+          xlink:href="https://gitlab.mi.hdm-stuttgart.de/goik/GoikLectures/blob/master/Doc/Sda1/Ref/Jdom/P/CreateScratch/src/main/java/de/hdm_stuttgart/mi/sda1/jdom/CreateDoc.java">final Element titel</link> = new Element("titel"); <co
           linkends="sda1_dom_createXmlFromScratch-1"
           xml:id="sda1_dom_createXmlFromScratch-1-co"/>