DOC: update/fix autoscaling documentation (matplotlib#25656)

* Update autoscaling documentation

* Update galleries/users_explain/axes/autoscale.py

Co-authored-by: Elliott Sales de Andrade <[email protected]>

* wrapped text to ensure lint checks passed

---------

Co-authored-by: Elliott Sales de Andrade <[email protected]>

Author: alissaahodge

galleries/users_explain/axes/autoscale.py

@@ -29,12 +29,15 @@
 # %%
 # Margins
 # -------
-# The default margin around the data limits is 5%:
+# The default margin around the data limits is 5%, which is based on the
+# default configuration setting of :rc:`axes.xmargin`, :rc:`axes.ymargin`,
+# and :rc:`axes.zmargin`:
 
 print(ax.margins())
 
 # %%
-# The margins can be made larger using `~matplotlib.axes.Axes.margins`:
+# The margin size can be overridden to make them smaller or larger using
+# `~matplotlib.axes.Axes.margins`:
 
 fig, ax = plt.subplots()
 ax.plot(x, y)