Fix interval keyword argument in oedi_9068 gallery example (#2793)

* Fix interval keyword argument in oedi_9068 gallery example

Fixes #2791.

The oedi_9068 gallery example calls get_nsrdb_psm4_conus() with
interval=5, but the function's parameter is named time_step (the
interval name comes from the NSRDB API query string, not the Python
signature). This was missed when PR #2582 migrated the example from
get_psm3 (which used interval) to get_nsrdb_psm4_conus (which uses
time_step).

Changes interval=5 to time_step=5 in the example call.

No test changes needed — test_get_nsrdb_psm4_conus_5min already
exercises time_step=5 against the function directly.

* Apply review feedback: update PSM3→PSM4 references and add contributor

- Update narrative comments from 'NSRDB PSM3' to 'NSRDB PSM4' to
  match the actual function called (get_nsrdb_psm4_conus)
- Rename psm3/psm3_metadata variables to psm4/psm4_metadata for
  consistency with the PSM4 data source
- Add Karl Hill to Contributors in v0.15.3 whatsnew

Addresses Copilot suggestions (+1 from @cwhanse) on PR #2793.

---------

Co-authored-by: Kevin Anderson <kevin.anderso@gmail.com>

Author: karlhillx

docs/examples/system-models/oedi_9068.py

@@ -7,7 +7,7 @@
 """
 # %%
 # This example model uses satellite-based solar resource data from the
-# NSRDB PSM3. This approach is useful for pre-construction energy modeling
+# NSRDB PSM4. This approach is useful for pre-construction energy modeling
 # and in retrospective analyses where the system’s own irradiance
 # measurements are not present or unreliable.
 #
@@ -135,17 +135,18 @@
 #
 # The system does have measured plane-of-array irradiance data, but the
 # measurements suffer from row-to-row shading and tracker stalls. In this
-# example, we will use weather data taken from the NSRDB PSM3 for the year
+# example, we will use weather data taken from the NSRDB PSM4 for the year
 # 2019.
 
 api_key = 'DEMO_KEY'
 email = 'your_email@domain.com'
 
 keys = ['ghi', 'dni', 'dhi', 'temp_air', 'wind_speed',
         'albedo', 'precipitable_water']
-psm3, psm3_metadata = pvlib.iotools.get_nsrdb_psm4_conus(latitude, longitude,
+psm4, psm4_metadata = pvlib.iotools.get_nsrdb_psm4_conus(latitude, longitude,
                                                          api_key, email,
-                                                         year=2019, interval=5,
+                                                         year=2019,
+                                                         time_step=5,
                                                          parameters=keys,
                                                          map_variables=True,
                                                          leap_day=True)
@@ -167,20 +168,20 @@
 # module fraction and returns the average irradiance over the total module
 # surface.
 
-solar_position = location.get_solarposition(psm3.index)
+solar_position = location.get_solarposition(psm4.index)
 tracker_angles = mount.get_orientation(
     solar_position['apparent_zenith'],
     solar_position['azimuth']
 )
-dni_extra = pvlib.irradiance.get_extra_radiation(psm3.index)
+dni_extra = pvlib.irradiance.get_extra_radiation(psm4.index)
 
 # note: this system is monofacial, so only calculate irradiance for the
 # front side:
 averaged_irradiance = pvlib.bifacial.infinite_sheds.get_irradiance_poa(
     tracker_angles['surface_tilt'], tracker_angles['surface_azimuth'],
     solar_position['apparent_zenith'], solar_position['azimuth'],
     gcr, axis_height, pitch,
-    psm3['ghi'], psm3['dhi'], psm3['dni'], psm3['albedo'],
+    psm4['ghi'], psm4['dhi'], psm4['dni'], psm4['albedo'],
     model='haydavies', dni_extra=dni_extra,
 )
 
@@ -191,14 +192,14 @@
 
 cell_temperature_steady_state = pvlib.temperature.faiman(
     poa_global=averaged_irradiance['poa_global'],
-    temp_air=psm3['temp_air'],
-    wind_speed=psm3['wind_speed'],
+    temp_air=psm4['temp_air'],
+    wind_speed=psm4['wind_speed'],
     **temperature_model_parameters,
 )
 
 cell_temperature = pvlib.temperature.prilliman(
     cell_temperature_steady_state,
-    psm3['wind_speed'],
+    psm4['wind_speed'],
     unit_mass=module_unit_mass
 )
 
@@ -215,7 +216,7 @@
     'poa_direct': averaged_irradiance['poa_direct'],
     'poa_diffuse': averaged_irradiance['poa_diffuse'],
     'cell_temperature': cell_temperature,
-    'precipitable_water': psm3['precipitable_water'],  # for the spectral model
+    'precipitable_water': psm4['precipitable_water'],  # for the spectral model
 })
 model.run_model_from_poa(weather_inputs)
 

docs/sphinx/source/whatsnew/v0.15.3.rst

@@ -23,6 +23,8 @@ Enhancements
 Documentation
 ~~~~~~~~~~~~~
 * Fix broken link in GitHub Contributing tab. (:issue:`2628`, :pull:`2806`)
+* Fixed broken ``interval`` keyword argument in the ``oedi_9068`` gallery
+  example; the correct parameter name is ``time_step``. (:issue:`2791`)
 
 
 Testing
@@ -43,4 +45,5 @@ Maintenance
 
 Contributors
 ~~~~~~~~~~~~
+* Karl Hill (:ghuser:`karlhillx`)
 * Yonry Zhu (:ghuser:`yonryzhu`)