Fix whitespace

Author: cdce8p

peps/pep-0845.rst

@@ -134,9 +134,9 @@ existing variable if one exists, or raise an error.
     ...        pass
     ...
     Traceback (most recent call last):
-    File "<python-input-8>", line 2, in <module>
+    File "<python-input-0>", line 2, in <module>
         case [x, *_, .x]:
-                    ^
+                      ^
     NameError: name 'x' is not defined
 
 Grammar