Fix Python version since which external enities are not resolved by default. (GH-11237)

Doc/library/xml.dom.pulldom.rst

@@ -25,7 +25,7 @@ events until either processing is finished or an error condition occurs.
    maliciously constructed data.  If you need to parse untrusted or
    unauthenticated data see :ref:`xml-vulnerabilities`.
 
-.. versionchanged:: 3.8
+.. versionchanged:: 3.7.1
 
    The SAX parser no longer processes general external entities by default to
    increase security by default. To enable processing of external entities,

Doc/library/xml.rst

@@ -75,7 +75,7 @@ decompression bomb         Safe             Safe              Safe             S
 2. :mod:`xml.dom.minidom` doesn't expand external entities and simply returns
    the unexpanded entity verbatim.
 3. :mod:`xmlrpclib` doesn't expand external entities and omits them.
-4. Since Python 3.8, external general entities are no longer processed by
+4. Since Python 3.7.1, external general entities are no longer processed by
    default.
 
 

Doc/library/xml.sax.rst

@@ -24,7 +24,7 @@ the SAX API.
    constructed data.  If you need to parse untrusted or unauthenticated data see
    :ref:`xml-vulnerabilities`.
 
-.. versionchanged:: 3.8
+.. versionchanged:: 3.7.1
 
    The SAX parser no longer processes general external entities by default
    to increase security. Before, the parser created network connections