add ioff/ion context api note

ianhi · ianhi · commit 0f5840c8d824 · 2020-08-05T12:22:02.000-04:00
diff --git a/doc/api/next_api_changes/behavior/17371-IHI.rst b/doc/api/next_api_changes/behavior/17371-IHI.rst
@@ -0,0 +1,7 @@
+ioff and ion can be used as context managers
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+``plt.ion()`` and ``plt.ioff()`` may now be used as context managers to create
+a context with interactive mode off, or on respectively. The old behavior of
+calling these functions was maintained. To use the new functionality
+call as ``with plt.ioff():``
