move and reword NEWS entry

Author: tungol

Misc/NEWS.d/next/Documentation/2024-12-15-14-08-40.gh-issue-127209.17oPD0.rst

@@ -0,0 +1,6 @@
+:method:`socketserver.BaseServer.get_request` now raises ``NotImplementedError``.
+It was previously absent and attempting to use it would generate an
+``AttributeError``. :class:`socketserver.BaseServer` no longer assumes that
+all subclasses will add a ``socket`` attribute. Updated documentation to
+clarify the differences between :class:`socketserver.BaseServer` and
+:class:`socketserver.TCPServer`.