Issue #23921: Standardized documentation whitespace formatting.
Original patch by James Edwards.
diff --git a/Doc/tutorial/stdlib.rst b/Doc/tutorial/stdlib.rst
index eca685c..52ffdbe 100644
--- a/Doc/tutorial/stdlib.rst
+++ b/Doc/tutorial/stdlib.rst
@@ -301,7 +301,7 @@
            with self.assertRaises(TypeError):
                average(20, 30, 70)
 
-   unittest.main() # Calling from the command line invokes all tests
+   unittest.main()  # Calling from the command line invokes all tests
 
 
 .. _tut-batteries-included: