small docfix in ExponentialCutoffPowerLaw
@@ -834,7 +834,7 @@ class ExponentialCutoffPowerLaw(SpectralModel):
:math:`\phi_0`
reference : `~astropy.units.Quantity`
:math:`E_0`
- lambda : `~astropy.units.Quantity`
+ lambda_ : `~astropy.units.Quantity`
:math:`\lambda`
Examples
