Docs: Fixed RobotStateComponent HowTo

etc/doxygen/pages/HowTos.dox

@@ -130,7 +130,7 @@ The robot instance can be manually synchronized with the remote data structure (
 
 If a complete robot model (including 3d models) is needed, you can pass a filename to a local file to allow the system to load the complete robot:
 \code
-    std::string filename = "Armar3/data/robotmodel/ArmarIII.xml";
+    std::string robotFile = "Armar3/data/robotmodel/ArmarIII.xml";
     ArmarXDataPath::getAbsolutePath(robotFile,robotFile);
     VirtualRobot::RobotPtr robot = RemoteRobot::createLocalClone(robotStateComponent, filename);
 \endcode