Issue #13637: Remove outdated versionchanged directives.

Patch by Martin Panter.

Doc/library/binascii.rst

@@ -65,9 +65,6 @@ The :mod:`binascii` module defines the following functions:
    data. More than one line may be passed at a time. If the optional argument
    *header* is present and true, underscores will be decoded as spaces.
 
-   .. versionchanged:: 3.2
-      Accept only bytestring or bytearray objects as input.
-
 
 .. function:: b2a_qp(data, quotetabs=False, istext=True, header=False)
 
@@ -156,9 +153,6 @@ The :mod:`binascii` module defines the following functions:
    of hexadecimal digits (which can be upper or lower case), otherwise a
    :exc:`TypeError` is raised.
 
-   .. versionchanged:: 3.2
-      Accept only bytestring or bytearray objects as input.
-
 
 .. exception:: Error