Issue #23921: Standardized documentation whitespace formatting.
Original patch by James Edwards.
diff --git a/Doc/tutorial/modules.rst b/Doc/tutorial/modules.rst
index 5fbd879..261a3f3 100644
--- a/Doc/tutorial/modules.rst
+++ b/Doc/tutorial/modules.rst
@@ -34,7 +34,7 @@
            a, b = b, a+b
        print()
 
-   def fib2(n): # return Fibonacci series up to n
+   def fib2(n):   # return Fibonacci series up to n
        result = []
        a, b = 0, 1
        while b < n: