bpo-40552 Add 'users' variable in code sample (tutorial 4.2). (GH-19992)

* Add 'users' variable in code sample.

* 📜🤖 Added by blurb_it.

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>

Author: awecx

Doc/tutorial/controlflow.rst

@@ -70,6 +70,9 @@ Code that modifies a collection while iterating over that same collection can
 be tricky to get right.  Instead, it is usually more straight-forward to loop
 over a copy of the collection or to create a new collection::
 
+    # Create a sample collection
+    users = {'Hans': 'active', 'Éléonore': 'inactive', '景太郎': 'active'}
+
     # Strategy:  Iterate over a copy
     for user, status in users.copy().items():
         if status == 'inactive':

Misc/NEWS.d/next/Documentation/2020-05-09-12-10-31.bpo-40552._0uB73.rst

@@ -0,0 +1,2 @@
+Fix in tutorial section 4.2.
+Code snippet is now correct.