Issue #23047: Fix typo in pyporting.rst.

Patch by Chaitanya agrawal.
diff --git a/Doc/howto/pyporting.rst b/Doc/howto/pyporting.rst
index 624537c..59c127e 100644
--- a/Doc/howto/pyporting.rst
+++ b/Doc/howto/pyporting.rst
@@ -295,7 +295,7 @@
 
     from __future__ import absolute_import
     from __future__ import division
-    from __future__ import print_statement
+    from __future__ import print_function
     from __future__ import unicode_literals
 
 You can also run Python 2 with the ``-3`` flag to be warned about various