Apply suggestions from code review

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

Author: AdamRJensen

docs/examples/solar-tracking/plot_single_axis_tracking.py

@@ -60,7 +60,7 @@
 
 for gcr in [0.2, 0.4, 0.6]:
     backtracking_angles = tracking.singleaxis(
-        apparent=solpos['apparent_zenith'],
+        apparent_zenith=solpos['apparent_zenith'],
         solar_azimuth=solpos['azimuth'],
         axis_tilt=0,
         axis_azimuth=180,

docs/examples/solar-tracking/plot_single_axis_tracking_on_sloped_terrain.py

@@ -99,7 +99,7 @@
 fig, ax = plt.subplots()
 for cross_axis_tilt in [0, 5, 10]:
     tracker_data = tracking.singleaxis(
-        apparent=solpos['apparent_zenith'],
+        apparent_zenith=solpos['apparent_zenith'],
         solar_azimuth=solpos['azimuth'],
         axis_tilt=0,  # flat because the axis is perpendicular to the slope
         axis_azimuth=180,  # N-S axis, azimuth facing south
@@ -155,7 +155,7 @@
 # before:
 
 tracker_data = tracking.singleaxis(
-    apparent=solpos['apparent_zenith'],
+    apparent_zenith=solpos['apparent_zenith'],
     solar_azimuth=solpos['azimuth'],
     axis_tilt=axis_tilt,  # no longer flat because the terrain imparts a tilt
     axis_azimuth=axis_azimuth,