Merge pull request matplotlib#28279 from tacaswell/doc/ipython_dep

Doc/ipython dep

Author: ianthomas23

doc/devel/min_dep_policy.rst

@@ -51,6 +51,14 @@ versions no longer support our minimum NumPy or Python.
 
 We will work around bugs in our dependencies when practical.
 
+IPython and Matplotlib do not formally depend on each other, however there is
+practical coupling for the integration of Matplotlib's UI into IPython and
+IPykernel.  We will ensure this integration works with at least minor or major
+versions of IPython and IPykernel released in the 24 months prior to our
+planned release date.  Matplotlib may or may not work with older versions and
+we will not warn if used with IPython or IPykernel outside of this window.
+
+
 
 Test and documentation dependencies
 ===================================