[Newton] Fixed a typo for NewtonCfg (#3415)

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Author: Milad-Rakhsha-NV

source/isaaclab/isaaclab/sim/_impl/newton_manager_cfg.py

@@ -27,7 +27,7 @@ class NewtonCfg:
     If set to False, the simulation performance will be severely degraded.
     """
 
-    newton_viwer_update_frequency: int = 1
+    newton_viewer_update_frequency: int = 1
     """Frequency of updates to the Newton viewer."""
 
     newton_viewer_camera_pos: tuple[float, float, float] = (10.0, 0.0, 3.0)