Unfortunately this enhancement breaks test_enum.

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FAIL: test_pydoc (test.test_enum.TestStdLib)
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Traceback (most recent call last):
  File "/home/serhiy/py/cpython/Lib/test/test_enum.py", line 1609, in test_pydoc
    self.assertEqual(result, expected_text)
AssertionError: 'Help[68 chars]n |  Generic enumeration.\n |  \n |  Derive fr[876 chars]ing.' != 'Help[68 chars]n |  Method resolution order:\n |      Color\n[782 chars]ing.'
  Help on class Color in module test.test_enum:
  
  class Color(enum.Enum)
-  |  Generic enumeration.
-  |  
-  |  Derive from this class to define new enumerations.
-  |  
   |  Method resolution order:
   |      Color
   |      enum.Enum
   |      builtins.object
   |  
   |  Data and other attributes defined here:
   |  
   |  blue = <Color.blue: 3>
   |  
   |  green = <Color.green: 2>
   |  
   |  red = <Color.red: 1>
   |  
   |  ----------------------------------------------------------------------
   |  Data descriptors inherited from enum.Enum:
   |  
   |  name
   |      The name of the Enum member.
   |  
   |  value
   |      The value of the Enum member.
   |  
   |  ----------------------------------------------------------------------
   |  Data descriptors inherited from enum.EnumMeta:
   |  
   |  __members__
   |      Returns a mapping of member name->value.
   |      
   |      This mapping lists all enum members, including aliases. Note that this
   |      is a read-only view of the internal mapping.

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