Fix docstrings

Author: cbcrespo

pvlib/irradiance.py

@@ -624,22 +624,18 @@ def isotropic(surface_tilt, dhi, return_components=False):
         Diffuse horizontal irradiance, must be >=0. See :term:`dhi`.
 
     return_components : bool, default `False`
-        If `False`, ``sky_diffuse`` is returned.
-        If `True`, ``diffuse_components`` is returned.
-        For this model, return_components does not add more information,
+        If ``False``, ``sky_diffuse`` is returned.
+        If ``True``, ``diffuse_components`` is returned.
+        For this model, ``return_components`` does not add more information,
         but it is included for consistency with the other sky diffuse models.
 
     Returns
     -------
-    numeric, Dict, or DataFrame
-        Return type controlled by ``return_components`` argument.
-        If `False`, ``sky_diffuse`` is returned.
-        If `True`, ``diffuse_components`` is returned.
-
-    sky_diffuse : numeric
+    sky_diffuse : numeric (if ``return_components`` is ``False``)
         The sky diffuse component of the solar radiation. [Wm⁻²]
 
     diffuse_components : Dict (array input) or DataFrame (Series input)
+    (if ``return_components`` is ``True``)
         Keys/columns are:
             * poa_sky_diffuse: Total sky diffuse
             * poa_isotropic

tests/test_irradiance.py

@@ -182,13 +182,13 @@ def test_isotropic_components(irrad_data):
     assert_frame_equal(result, expected, check_less_precise=4)
     # numpy
     result = irradiance.isotropic(
-        40, irrad_data['dhi'].values, return_components=True)
+        40, irrad_data['dhi'].to_numpy(), return_components=True)
     for key in keys:
         assert_allclose(result[key], expected[key], atol=1e-4)
     assert isinstance(result, dict)
     # scalar
     result = irradiance.isotropic(
-        40, irrad_data['dhi'].values[-1], return_components=True)
+        40, irrad_data['dhi'].to_numpy()[-1], return_components=True)
     for key in keys:
         assert_allclose(result[key], expected[key].iloc[-1], atol=1e-4)
     assert isinstance(result, dict)