correct grammar/typographic errors in comments (8 files)

code/AssetLib/3DS/3DSLoader.cpp

@@ -365,7 +365,7 @@ void Discreet3DSImporter::ParseChunk(const char *name, unsigned int num) {
     // IMPLEMENTATION NOTE;
     // Cameras or lights define their transformation in their parent node and in the
     // corresponding light or camera chunks. However, we read and process the latter
-    // to to be able to return valid cameras/lights even if no scenegraph is given.
+    // to be able to return valid cameras/lights even if no scenegraph is given.
 
     // get chunk type
     switch (chunk.Flag) {