restore whatsnew entry mistakenly deleted in #2762

Author: kandersolar

docs/sphinx/source/whatsnew/v0.15.2.rst

@@ -42,6 +42,9 @@ Bug fixes
 
 Enhancements
 ~~~~~~~~~~~~
+* Add the ``front_side_fraction`` parameter to
+  :py:func:`pvlib.snow.loss_townsend` to support Townsend snow-loss
+  workflows for bifacial systems. (:issue:`2755`, :pull:`2756`)
 * Add the following parameters to :py:func:`~pvlib.iotools.get_nasa_power`
   when ``map_variables=True``: ``temp_dew``, ``precipitable_water``,
   ``relative_humidity``, ``ghi_extra``, ``dhi_clear``, ``longwave_down``,