Added the usage report to the examples for when no arguments are passed

to the examples.

examples/osgtext/osgtext.cpp

@@ -430,7 +430,7 @@ int main( int argc, char **argv )
     osg::ArgumentParser arguments(&argc,argv);
     
     // set up the usage document, in case we need to print out how to use this program.
-    arguments.getApplicationUsage()->setCommandLineUsage(arguments.getProgramName()+" [options] [filename] ...");
+    arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] [filename] ...");
     arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
     
 
@@ -459,7 +459,7 @@ int main( int argc, char **argv )
         arguments.writeErrorMessages(std::cout);
         return 1;
     }
-
+    
 
     // read the scene from the list of file specified commandline args.
     osg::ref_ptr<osg::Node> rootNode = osgDB::readNodeFiles(arguments);