Fix whitespace

Author: Justin Baum

Lib/test/test_doctest.py

@@ -1318,7 +1318,7 @@ def optionflags(): r"""
 matching the expected output to the actual output
     >>> print("Hello World") # doctest: +IGNORE_CASE
     hello world
-    
+
 
 The SKIP flag causes an example to be skipped entirely.  I.e., the
 example is not run.  It can be useful in contexts where doctest