Apply suggestions from code review matplotlib#29325 (comment) matplotlib#29325 (comment)

Co-authored-by: Ruth Comer <[email protected]>

Author: cmp0xff

lib/matplotlib/axes/_base.py

@@ -4615,8 +4615,10 @@ def twinx(self, axes_class=None, **kwargs):
 
             By default, `~.axes.Axes` is used.
 
+            .. versionadded:: 3.10
+
         kwargs : dict
-            The keyword arguments passed to ``add_subplot()`` or ``add_axes()``.
+            The keyword arguments passed to `.Figure.add_subplot` or `.Figure.add_axes`.
 
         Returns
         -------
@@ -4660,8 +4662,10 @@ def twiny(self, axes_class=None, **kwargs):
 
             By default, `~.axes.Axes` is used.
 
+            .. versionadded:: 3.10
+
         kwargs : dict
-            The keyword arguments passed to ``add_subplot()`` or ``add_axes()``.
+            The keyword arguments passed to `.Figure.add_subplot` or `.Figure.add_axes`.
 
         Returns
         -------