diff --git a/IPython/core/tests/test_display.py b/IPython/core/tests/test_display.py
index be0f85c..c5a31d5 100644
--- a/IPython/core/tests/test_display.py
+++ b/IPython/core/tests/test_display.py
@@ -183,7 +183,7 @@ def test_set_matplotlib_formats_kwargs():
     ip = get_ipython()
     cfg = _get_inline_config()
     cfg.print_figure_kwargs.update(dict(foo='bar'))
-    kwargs = dict(quality=10)
+    kwargs = dict(dpi=150)
     display.set_matplotlib_formats('png', **kwargs)
     formatter = ip.display_formatter.formatters['image/png']
     f = formatter.lookup_by_type(Figure)
diff --git a/IPython/lib/display.py b/IPython/lib/display.py
index e8b8a44..012b3ab 100644
--- a/IPython/lib/display.py
+++ b/IPython/lib/display.py
@@ -8,6 +8,8 @@ from os import walk, sep, fsdecode
 
 from IPython.core.display import DisplayObject, TextDisplayObject
 
+from typing import Tuple
+
 __all__ = ['Audio', 'IFrame', 'YouTubeVideo', 'VimeoVideo', 'ScribdDocument',
            'FileLink', 'FileLinks', 'Code']
 
@@ -159,7 +161,7 @@ class Audio(DisplayObject):
         return val
 
     @staticmethod
-    def _validate_and_normalize_with_numpy(data, normalize):
+    def _validate_and_normalize_with_numpy(data, normalize) -> Tuple[bytes, int]:
         import numpy as np
 
         data = np.array(data, dtype=float)
@@ -178,8 +180,7 @@ class Audio(DisplayObject):
         max_abs_value = np.max(np.abs(data))
         normalization_factor = Audio._get_normalization_factor(max_abs_value, normalize)
         scaled = data / normalization_factor * 32767
-        return scaled.astype('<h').tostring(), nchan
-
+        return scaled.astype("<h").tobytes(), nchan
 
     @staticmethod
     def _validate_and_normalize_without_numpy(data, normalize):
diff --git a/docs/source/whatsnew/version7.rst b/docs/source/whatsnew/version7.rst
index e8329bb..02c46af 100644
--- a/docs/source/whatsnew/version7.rst
+++ b/docs/source/whatsnew/version7.rst
@@ -3,7 +3,9 @@
 ============
 
 .. _version 7.22:
-=================
+
+IPython 7.22
+============
 
 
 Thanks
@@ -16,7 +18,7 @@ codebase; they now have triage permissions to the IPython repository and we'll
 work toward giving them more permission in the future.
 
 Many thanks to all the contributors to this release you can find all individual
-contributions to this milestone `on github <https://github.com/ipython/ipython/milestone/XX>`_.
+contributions to this milestone `on github <https://github.com/ipython/ipython/milestone/XX>`__.
 
 Thanks as well to organisations, QuantStack for working on debugger
 compatibility for Xeus_python, and the `D. E. Shaw group
@@ -53,7 +55,7 @@ Thanks
 ------
 
 Many thanks to all the contributors to this release you can find all individual
-contribution to this milestone `on github <https://github.com/ipython/ipython/milestone/83>`_.
+contribution to this milestone `on github <https://github.com/ipython/ipython/milestone/83>`__.
 
 
 .. _version 720: