added a link to teetime's markdown module

pom.xml

@@ -257,7 +257,7 @@
 				<artifactId>maven-site-plugin</artifactId>
 				<version>3.3</version>
 				<dependencies>
-					<!-- for using markdown syntax -->
+					<!-- for using markdown syntax gitlab@build.se.informatik.uni-kiel.de:nts/doxia-module-markdown-teetime.git -->
 					<dependency>
 						<groupId>org.apache.maven.doxia</groupId>
 						<artifactId>doxia-module-markdown-teetime</artifactId>