Merge pull request #3085 from ackurth/type_iaf_psc_alpha_doc

Fix typo in documentation of ```iaf_psc_alpha```

models/iaf_psc_alpha.h

@@ -154,7 +154,7 @@ The following parameters can be set in the status dictionary.
 ``tau_syn_ex``  2 ms               :math:`\tau_{\text{syn, ex}}`   Rise time of the excitatory synaptic alpha function
 ``tau_syn_in``  2 ms               :math:`\tau_{\text{syn, in}}`   Rise time of the inhibitory synaptic alpha function
 ``I_e``         0 pA               :math:`I_\text{e}`              Constant input current
-``V_min``       :math:`-\infty` mV :math:`V_{\text{min}}`          Absolute lower value for the membrane potenial (default :math:`-\infty`)
+``V_min``       :math:`-\infty` mV :math:`V_{\text{min}}`          Absolute lower value for the membrane potential
 =============== ================== =============================== ========================================================================
 
 The following state variables evolve during simulation and are available either as neuron properties or as recordables.