bpo-39377: json: Update doc about the encoding option. (GH-18076)

Co-authored-by: Kyle Stanley <[email protected]>

Author: methane

Doc/library/json.rst

@@ -283,19 +283,18 @@ Basic Usage
    instance containing a JSON document) to a Python object using this
    :ref:`conversion table <json-to-py-table>`.
 
-   The other arguments have the same meaning as in :func:`load`, except
-   *encoding* which is ignored and deprecated since Python 3.1.
+   The other arguments have the same meaning as in :func:`load`.
 
    If the data being deserialized is not a valid JSON document, a
    :exc:`JSONDecodeError` will be raised.
 
-   .. deprecated-removed:: 3.1 3.9
-      *encoding* keyword argument.
-
    .. versionchanged:: 3.6
       *s* can now be of type :class:`bytes` or :class:`bytearray`. The
       input encoding should be UTF-8, UTF-16 or UTF-32.
 
+   .. versionchanged:: 3.9
+      The keyword argument *encoding* has been removed.
+
 
 Encoders and Decoders
 ---------------------

Doc/whatsnew/3.9.rst

@@ -424,11 +424,15 @@ Removed
   (Contributed by Victor Stinner in :issue:`39350`.)
 
 * The *buffering* parameter of :class:`bz2.BZ2File` has been removed. Since
-  Python 3.0, it was ignored and using it was emitting
-  :exc:`DeprecationWarning`. Pass an open file object to control how the file
-  is opened.
+  Python 3.0, it was ignored and using it emitted a :exc:`DeprecationWarning`.
+  Pass an open file object to control how the file is opened.
   (Contributed by Victor Stinner in :issue:`39357`.)
 
+* The *encoding* parameter of :func:`json.loads` has been removed.
+  As of Python 3.1, it was deprecated and ignored; using it has emitted a
+  :exc:`DeprecationWarning` since Python 3.8.
+  (Contributed by Inada Naoki in :issue:`39377`)
+
 
 Porting to Python 3.9
 =====================