Remove obsolete term + indicate how to find the program (#1626300).

Suggested by Terry J. Reedy.
diff --git a/Doc/distutils/introduction.rst b/Doc/distutils/introduction.rst
index 2d5dbc7..fc6184f 100644
--- a/Doc/distutils/introduction.rst
+++ b/Doc/distutils/introduction.rst
@@ -84,8 +84,8 @@
 
    python setup.py sdist
 
-For Windows, open a command prompt windows ("DOS box") and change the command
-to::
+For Windows, open a command prompt windows (:menuselection:`Start -->
+Accessories`) and change the command to::
 
    setup.py sdist