Apply suggestions from code review

Co-authored-by: Wei Ji <23487320+weiji14@users.noreply.github.com>

Author: michaelgrund

examples/gallery/3d_plots/scatter3d.py

@@ -36,11 +36,11 @@
 
 # Define a colormap to be used for three categories, define the range of the
 # new discrete CPT using series=(lowest_value, highest_value, interval),
-# use color_model="+csetosa,versicolor,virginica" to write the discrete color palette
+# use color_model="+cSetosa,Versicolor,Virginica" to write the discrete color palette
 # "cubhelix" in categorical format and add the species names as annotations for the
 # colorbar
 pygmt.makecpt(
-    cmap="cubhelix", color_model="+csetosa,versicolor,virginica", series=(0, 2, 1)
+    cmap="cubhelix", color_model="+cSetosa,Versicolor,Virginica", series=(0, 2, 1)
 )
 
 fig.plot3d(
@@ -62,9 +62,9 @@
     # Set frame parameters
     frame=[
         'WsNeZ3+t"Iris flower data set"',  # z axis label positioned on 3rd corner, add title
-        'xafg+l"Petal Width"',
-        'yafg+l"Sepal Length"',
-        'zafg+l"Petal Length"',
+        'xafg+l"Petal Width (cm)"',
+        'yafg+l"Sepal Length (cm)"',
+        'zafg+l"Petal Length (cm)"',
     ],
     # Set perspective to azimuth NorthWest (315°), at elevation 25°
     perspective=[315, 25],