Fix spelling mistakes

Author: AdamRJensen

docs/examples/agrivoltaics/plot_agrivoltaics_ground_irradiance.py

@@ -11,15 +11,15 @@
 # For an overview of agrivPV concepts and performance, the reader
 # is referred to :doi:`10.69766/XAEU5008`.
 #
-# The first steps is to define the plant location and calculate solar position
+# The first step is to define the plant location and calculate solar position
 # and clearsky irradiance for a single day as an example.
 #
 # .. figure:: ../../_images/agrivoltaics_system.jpg
 #    :align: center
 #    :width: 75%
 #    :alt: Photo of an agriPV system
 #
-#    Photo of a agriPV system
+#    Photo of an agriPV system.
 #    *Source: Adam R. Jensen*
 
 import pvlib
@@ -38,16 +38,16 @@
 # %%
 # Next, we need to define the plant layout:
 
-height = 3  # []
+height = 3  # [m] height of torque above ground
 pitch = 12  # [m] row spacing
 row_width = 2 * 2  # [m] two modules in portrait, each 2 m long
-gcr = row_width / pitch  # [-]
+gcr = row_width / pitch  # [unitless]
 axis_azimuth = 0  # [degrees] north-south tracking axis
 max_angle = 50  # [degrees] maximum rotation angle
 
 # %%
 # Before running the infinite sheds model, we need to know the orientation
-# of the trackers. For single-axis tracker, this can be calculated as follows:
+# of the trackers. For a single-axis tracker, this can be calculated as:
 
 tracking_orientations = pvlib.tracking.singleaxis(
     apparent_zenith=solpos['apparent_zenith'],