NIT fix comment

serializers/src/OBJ/objSerializer.ts

@@ -68,7 +68,7 @@ export class OBJExport {
 
             for (var i = 0; i < trunkVerts.length; i += 3) {
                 // Babylon.js default is left handed, while OBJ default is right handed
-                // Need to invert X vertices unless Babylon is set to use a right handed system
+                // Need to invert Z vertices unless Babylon is set to use a right handed system
                 if (mesh[0].getScene().useRightHandedSystem) {
                     output.push("v " + trunkVerts[i] + " " + trunkVerts[i + 1] + " " + trunkVerts[i + 2]);
                 } else {