Fix typos and spelling.

src/osgUtil/IntersectionVisitor.cpp

@@ -51,7 +51,7 @@ Intersector* IntersectorGroup::clone(osgUtil::IntersectionVisitor& iv)
 {
     IntersectorGroup* ig = new IntersectorGroup;
 
-    // now copy across all intersectors that arn't disabled.
+    // now copy across all intersectors that aren't disabled.
     for(Intersectors::iterator itr = _intersectors.begin();
         itr != _intersectors.end();
         ++itr)

src/osgUtil/Optimizer.cpp

@@ -939,7 +939,7 @@ void CollectLowestTransformsVisitor::disableObject(ObjectMap::iterator itr)
 
     if (itr->second._canBeApplied)
     {
-        // we havn't been disabled yet so we need to disable,
+        // we haven't been disabled yet so we need to disable,
         itr->second._canBeApplied = false;
 
         // and then inform everybody we have been disabled.
@@ -963,7 +963,7 @@ void CollectLowestTransformsVisitor::disableTransform(osg::Transform* transform)
     if (itr->second._canBeApplied)
     {
 
-        // we havn't been disabled yet so we need to disable,
+        // we haven't been disabled yet so we need to disable,
         itr->second._canBeApplied = false;
         // and then inform everybody we have been disabled.
         for(TransformStruct::ObjectSet::iterator oitr = itr->second._objectSet.begin();

src/osgUtil/SceneView.cpp

@@ -913,7 +913,7 @@ bool SceneView::cullStage(const osg::Matrixd& projection,const osg::Matrixd& mod
     // note, this would be not required if the rendergraph had been
     // reset at the start of each frame (see top of this method) but
     // a clean has been used instead to try to minimize the amount of
-    // allocation and deleteing of the StateGraph nodes.
+    // allocation and deleting of the StateGraph nodes.
     rendergraph->prune();
 
     // set the number of dynamic objects in the scene.
@@ -957,7 +957,7 @@ void SceneView::draw()
 
     osg::State* state = _renderInfo.getState();
 
-    // we in theory should be able to be able to bypass reset, but we'll call it just incase.
+    // we in theory should be able to be able to bypass reset, but we'll call it just in case.
     //_state->reset();
     state->setFrameStamp(_frameStamp.get());