Better changelog entry

Co-authored-by: Erlend E. Aasland <[email protected]>

Author: hroncok

Misc/NEWS.d/next/Build/2022-10-26-12-37-52.gh-issue-98707.eVXGEx.rst

@@ -1,4 +1,4 @@
-Don't let ``--with-system-libmpdec`` or ``--with-system-expat`` use the
-vendored headers of libmpdec or expact. When the ``--with-system-...`` flag
-is passed to ``./configure``, the ``Modules/_decimal/libmpdec`` or
-``Modules/expat`` directory can be safely removed before building Python.
+Don't use vendored ``libmpdec`` headers if :option:`--with-system-libmpdec`
+is passed to :program:`configure`.
+Don't use vendored ``libexpat`` headers if :option:`--with-system-expat`
+is passed to :program:`!configure`.