distutils example: fix invalid rst in description string
diff --git a/Doc/distutils/examples.rst b/Doc/distutils/examples.rst
index 2ca76a0..af9125a 100644
--- a/Doc/distutils/examples.rst
+++ b/Doc/distutils/examples.rst
@@ -264,7 +264,7 @@
 
     desc = """\
     My description
-    =============
+    ==============
 
     This is the description of the ``foobar`` package.
     """