Refs #32372 -- Updated manager name in related objects reference docs.

Follow up to 725c549.

Author: jackaitken

docs/ref/models/relations.txt

@@ -22,7 +22,7 @@ Related objects reference
                 blog = models.ForeignKey(Blog, on_delete=models.CASCADE, null=True)
 
       In the above example, the methods below will be available on
-      the manager ``reporter.article_set``.
+      the manager ``blog.entry_set``.
 
     * Both sides of a :class:`~django.db.models.ManyToManyField` relation::