Merge pull request matplotlib#31439 from Chirag3841/fix-secondary-axis-doc

Clarify SecondaryAxes limit behavior via documentation

Author: timhoffm

lib/matplotlib/axes/_secondary_axes.py

@@ -333,7 +333,10 @@ def set_color(self, color):
     components except for the complementary axis are hidden. You may modify
     the complementary axis, e.g. by setting ticks or an axis label. However,
     it is not designed to hold data, so that you should not call any
-    plotting methods on it.
+    plotting methods on it. Its limits are derived from the parent Axes via
+    the specified transformation, and setting limits on the secondary axis
+    (e.g., via ``set_xlim`` or ``set_ylim``) has no effect.
+
 
 Other Parameters
 ----------------