Issue #23006 whitespace

Doc/library/stdtypes.rst

@@ -3761,8 +3761,8 @@ pairs within braces, for example: ``{'jack': 4098, 'sjoerd': 4127}`` or ``{4098:
       Return the item of *d* with key *key*.  Raises a :exc:`KeyError` if *key* is
       not in the map.
 
-	  .. index:: __missing__()
-
+      .. index:: __missing__()
+  
       If a subclass of dict defines a method :meth:`__missing__` and *key*
       is not present, the ``d[key]`` operation calls that method with the key *key*
       as argument.  The ``d[key]`` operation then returns or raises whatever is