Add missing fit_desoto_batzelis documentation references (pvlib#2744)

* list `fit_deosoto_batzelis` in parameter fitting section

* list on the SDM user's guide page too

Author: kandersolar

docs/sphinx/source/reference/pv_modeling/parameters.rst

@@ -14,6 +14,7 @@ Functions for fitting single diode models
     ivtools.sdm.fit_pvsyst_sandia
     ivtools.sdm.fit_pvsyst_iec61853_sandia_2025
     ivtools.sdm.fit_desoto_sandia
+    ivtools.sdm.fit_desoto_batzelis
 
 Functions for fitting the single diode equation
 

docs/sphinx/source/user_guide/modeling_topics/singlediode.rst

@@ -95,6 +95,8 @@ from various datasources:
 +---------------------------------------------------------------+---------+--------------------+
 | :py:func:`~pvlib.ivtools.sdm.fit_desoto`                      | De Soto | datasheet          |
 +---------------------------------------------------------------+---------+--------------------+
+| :py:func:`~pvlib.ivtools.sdm.fit_desoto_batzelis`             | De Soto | datasheet          |
++---------------------------------------------------------------+---------+--------------------+
 | :py:func:`~pvlib.ivtools.sdm.fit_desoto_sandia`               | De Soto | I-V curves         |
 +---------------------------------------------------------------+---------+--------------------+
 | :py:func:`~pvlib.ivtools.sdm.fit_pvsyst_sandia`               | PVsyst  | I-V curves         |