Update Doc/library/ssl.rst

Co-authored-by: Jan Brasna <1784648+janbrasna@users.noreply.github.com>

Author: graingert

Doc/library/ssl.rst

@@ -2742,7 +2742,7 @@ disabled by default.
 
    >>> client_context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
    >>> client_context.minimum_version = ssl.TLSVersion.TLSv1_2
-   >>> client_context.maximum_version = ssl.TLSVersion.MAXIMUM_VERSION
+   >>> client_context.maximum_version = ssl.TLSVersion.MAXIMUM_SUPPORTED
 
 
 The SSL context created above will only allow TLSv1.3 and later (if