Added release notes for #5959

Author: radarhere

docs/releasenotes/9.1.0.rst

@@ -5,24 +5,37 @@ API Changes
 ===========
 
 Raise an error when performing a negative crop
-----------------------------------------------
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 Performing a negative crop on an image previously just returned a `(0, 0)` image. Now
 it will raise a `ValueError`, to help reduce confusion if a user has unintentionally
 provided the wrong arguments.
 
 Added specific error if path coordinate type is incorrect
----------------------------------------------------------
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 Rather than returning a `SystemError`, passing the incorrect types of coordinates into
 a path will now raise a more specific `ValueError`, with the message "incorrect
 coordinate type".
 
+Deprecations
+^^^^^^^^^^^^
+
+ImageShow.Viewer.show_file file argument
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The ``file`` argument in :py:meth:`~PIL.ImageShow.Viewer.show_file()` has been
+deprecated, replaced by ``path``.
+
+In effect, ``viewer.show_file("test.jpg")`` will continue to work unchanged.
+``viewer.show_file(file="test.jpg")`` will raise a deprecation warning, and suggest
+``viewer.show_file(path="test.jpg")`` instead.
+
 API Additions
 =============
 
 Added get_photoshop_blocks() to parse Photoshop TIFF tag
---------------------------------------------------------
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 :py:meth:`~PIL.TiffImagePlugin.TiffImageFile.get_photoshop_blocks` has been added, to
 allow users to determine what Photoshop "Image Resource Blocks" are contained within an
@@ -36,7 +49,7 @@ Other Changes
 =============
 
 Image._repr_pretty_
--------------------
+^^^^^^^^^^^^^^^^^^^
 
 :py:meth:`~PIL.Image.Image._repr_pretty_` has been added to provide a representation of
 an image without the identity of the object. This allows Jupyter to describe an image