Fixed IntegrityError in docs/topics/db/examples/many_to_one.txt.

docs/topics/db/examples/many_to_one.txt

@@ -74,10 +74,9 @@ Create an Article via the Reporter object::
     >>> new_article.reporter.id
     1
 
-Create a new article, and add it to the article set::
+Create a new article::
 
-    >>> new_article2 = Article.objects.create(headline="Paul's story", pub_date=date(2006, 1, 17))
-    >>> r.article_set.add(new_article2)
+    >>> new_article2 = Article.objects.create(headline="Paul's story", pub_date=date(2006, 1, 17), reporter=r)
     >>> new_article2.reporter
     <Reporter: John Smith>
     >>> new_article2.reporter.id