add blank line for bullet list rendering

Author: RDaxini

pvlib/pvsystem.py

@@ -2240,6 +2240,7 @@ def sapm(effective_irradiance, temp_cell, module, *, temperature_ref=25,
     Both databases can be accessed using :py:func:`retrieve_sam`. The full list
     of SAPM parameters is presented in the table below. Those that are required
     in the ``module`` parameter to run this model are as follows:
+
     * ``C0–C3``
     * ``Isco``
     * ``Impo``