fix major variable issue

docs/day4.md

@@ -129,14 +129,12 @@ Let's get started:
 
     ```python
     import requests
-    import json
     ```
 
 3. Create the list_people function by adding the following:
 
-    ```python hl_lines="5-7"
+    ```python hl_lines="3-5"
     import requests
-    import json
 
     def list_people(people):
         print(people)
@@ -347,7 +345,7 @@ Let's make that a reality by simulating a slow internet connection.
     ```python hl_lines="3 3"
     import requests
     import json
-    import concurrent.futures import ThreadPoolExecutor
+    from concurrent.futures import ThreadPoolExecutor
     ```
 
 20. We need to modify our main program to call the update_people function in a different thread. To do this we need to keep track of a "future" object.
@@ -362,7 +360,7 @@ Let's make that a reality by simulating a slow internet connection.
         while True:
             choice = input(f"Please choose an option [{', '.join(choices)}]: ")
             if choice == "list":
-                people = list_people(future, people)
+                future, people = list_people(future, people)
             elif choice == "update":
                 future = ThreadPoolExecutor().submit(update_people, people)
             elif choice == "clear":
@@ -381,7 +379,7 @@ Let's make that a reality by simulating a slow internet connection.
         people = future.result()
         future = None
     print(people)
-    return people
+    return (future, people)
     ```
 
 22. Save with ++ctrl+s++
@@ -397,7 +395,7 @@ Let's make that a reality by simulating a slow internet connection.
             people = future.result()
             future = None
         print(people)
-        return people
+        return (future, people)
 
     def update_people(people):
         try:
@@ -419,7 +417,7 @@ Let's make that a reality by simulating a slow internet connection.
         while True:
             choice = input(f"Please choose an option [{', '.join(choices)}]: ")
             if choice == "list":
-                people = list_people(future, people)
+                future, people = list_people(future, people)
             elif choice == "update":
                 future = ThreadPoolExecutor().submit(update_people, people)
             elif choice == "clear":
@@ -430,8 +428,8 @@ Let's make that a reality by simulating a slow internet connection.
                 print("Invalid choice. Please try again.")
     ```
 
-24. Run 
-25. Now run `python menu.py`
+24. Now run `python menu.py`
+25. Type `list` and press ++enter++. Notice how there's nothing in the list.
 26. Type `update` and press ++enter++. Notice the menu returns instantly.
 27. In a moment you'll see "successfully updated people" print. Type `list` and press ++enter++.
 28. Type `clear` and press ++enter++