test: correct INPUT of examples/spin_polarized/ATOM (deepmodeling#5998)

Co-authored-by: root <pxlxingliang>

Author: pxlxingliang

examples/spin_polarized/ATOM/INPUT

@@ -26,7 +26,7 @@ basis_type              lcao  # lcao or pw
 gamma_only            1  # 0/1, replace KPT
 
 #Parameters (4.Smearing)
-smearing_method         gau    # mp/gau/fd/fixed, mp for metal gau for semicon
+smearing_method         gauss    # mp/gau/fd/fixed, mp for metal gau for semicon
 smearing_sigma          0.001  # Rydberg, 0.002 for mp 0.001 for gau
 
 #Parameters (5.Mixing)