From Jannik Heller, typo fixes

git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14832 16af8721-9629-0410-8352-f15c8da7e697

examples/osganimationtimeline/osganimationtimeline.cpp

@@ -98,9 +98,9 @@ struct ExampleTimelineUsage : public osgGA::GUIEventHandler
         {
             // we add a scratch head priority 1 each 10 second
             // note:
-            //      it's possible to add the same instance more then once on the timeline
+            //      it's possible to add the same instance more than once on the timeline
             //      the only things you need to take care is if you remove it. It will remove
-            //      all instance that exist on the timeline. If you need to differtiate
+            //      all instance that exist on the timeline. If you need to differentiate
             //      it's better to create a new instance
             tml->addActionAt(5.0 + 10.0 * i, _scratchHead.get(), 1);
         }