Issue #23921: Standardized documentation whitespace formatting.
Original patch by James Edwards.
diff --git a/Doc/reference/simple_stmts.rst b/Doc/reference/simple_stmts.rst
index 1aa1fc1..2c0b8db 100644
--- a/Doc/reference/simple_stmts.rst
+++ b/Doc/reference/simple_stmts.rst
@@ -306,12 +306,12 @@
 The simple form, ``assert expression``, is equivalent to ::
 
    if __debug__:
-      if not expression: raise AssertionError
+       if not expression: raise AssertionError
 
 The extended form, ``assert expression1, expression2``, is equivalent to ::
 
    if __debug__:
-      if not expression1: raise AssertionError(expression2)
+       if not expression1: raise AssertionError(expression2)
 
 .. index::
    single: __debug__