bpo-34161: Remove extra parentheses in output formatting tutorial (GH-8350)

The parentheses were incorrect.
(cherry picked from commit cb5f3fdb9d353a572dd22fb50a110e52d5bb81b1)

Co-authored-by: Aaqa Ishtyaq <aaqaishtyaq@gmail.com>
diff --git a/Doc/tutorial/inputoutput.rst b/Doc/tutorial/inputoutput.rst
index 417c3b1..dfe4c38 100644
--- a/Doc/tutorial/inputoutput.rst
+++ b/Doc/tutorial/inputoutput.rst
@@ -41,8 +41,8 @@
   ::
 
      >>> yes_votes = 42_572_654 ; no_votes = 43_132_495
-     >>> percentage = (yes_votes/(yes_votes+no_votes)
-     >>> '{:-9} YES votes  {:2.2%}'.format(yes_votes, percentage))
+     >>> percentage = yes_votes/(yes_votes+no_votes)
+     >>> '{:-9} YES votes  {:2.2%}'.format(yes_votes, percentage)
      ' 42572654 YES votes  49.67%'
 
 * Finally, you can do all the string handling yourself by using string slicing and