Trim redundant test comments

Author: tonghuaroot

Lib/test/test_email/test__header_value_parser.py

@@ -1863,8 +1863,7 @@ def test_get_display_name_for_invalid_address_field(self):
         self.assertEqual(display_name.value, '')
 
     def test_get_display_name_comment_only(self):
-        # A display name consisting only of a comment (CFWS) used to raise an
-        # uncaught IndexError; it now degrades to an empty display name.
+        # gh-151857: a comment-only (CFWS) display name raised IndexError.
         display_name = self._test_get_x(
             parser.get_display_name,
             '(c)', '(c)', ' "" ',
@@ -3155,25 +3154,22 @@ def mime_parameters_as_value(self,
             [('r', '"')],
             [errors.InvalidHeaderDefect]*2),
 
-        # gh-151857: A parameter name ending with the extended marker
-        # '*' but with no value used to raise an uncaught IndexError instead
-        # of degrading to a defect.  Each case below IndexErrors unpatched.
+        # gh-151857: a parameter name ending in the extended marker '*' with
+        # no value used to raise an uncaught IndexError instead of a defect.
         'extended_marker_no_value': (
             'name*',
             '',
             'name*',
             [],
             [errors.InvalidHeaderDefect]),
 
-        # Sectioned form ('*0*') reaches the same marker-consuming branch.
         'extended_marker_no_value_sectioned': (
             'name*0*',
             '',
             'name*0*',
             [],
             [errors.InvalidHeaderDefect]),
 
-        # A trailing marker-only parameter after a valid one.
         'extended_marker_no_value_after_param': (
             'x=1; name*',
             ' x="1"',

Lib/test/test_email/test_headerregistry.py

@@ -1427,8 +1427,7 @@ def test_groups_types(self):
         self.assertIsInstance(h.groups[0], Group)
 
     def test_comment_only_group_display_name(self):
-        # A group whose display name is only a comment used to raise an
-        # uncaught IndexError while parsing; it now degrades gracefully.
+        # gh-151857: a comment-only group display name raised IndexError.
         h = self.make_header('to', '(c):')
         self.assertEqual(h.groups[0].display_name, '')
         self.assertEqual(h.addresses, ())