Improve some docstrings

src/test_typing_extensions.py

@@ -3426,6 +3426,10 @@ def test_eq(self):
         # won't be the same.
         self.assertNotEqual(hash(ParamSpec('P')), hash(P))
 
+    @skipUnless(hasattr(typing, "ParamSpec"), "Only relevant if typing.ParamSpec exists")
+    def test_consistent_docstring(self):
+        self.assertEqual(ParamSpec.__doc__, typing.ParamSpec.__doc__)
+
 
 class ConcatenateTests(BaseTestCase):
     def test_basics(self):
@@ -3788,6 +3792,10 @@ def test_pickle(self):
                 self.assertEqual(z.__name__, typevartuple.__name__)
                 self.assertEqual(z.__default__, typevartuple.__default__)
 
+    @skipUnless(hasattr(typing, "TypeVarTuple"), "Only relevant if typing.TypeVarTuple exists")
+    def test_consistent_docstring(self):
+        self.assertEqual(TypeVarTuple.__doc__, typing.TypeVarTuple.__doc__)
+
 
 class FinalDecoratorTests(BaseTestCase):
     def test_final_unmodified(self):
@@ -4518,6 +4526,9 @@ def test_cannot_combine_explicit_and_infer(self):
         with self.assertRaises(ValueError):
             TypeVar('T', contravariant=True, infer_variance=True)
 
+    def test_docstring(self):
+        self.assertEqual(TypeVar.__doc__, typing.TypeVar.__doc__)
+
 
 class TypeVarLikeDefaultsTests(BaseTestCase):
     def test_typevar(self):

src/typing_extensions.py

@@ -1390,8 +1390,7 @@ def __instancecheck__(self, __instance: Any) -> bool:
 
 
 class TypeVar(metaclass=_TypeVarMeta):
-    """Type variable."""
-
+    __doc__ = typing.TypeVar.__doc__
     __module__ = 'typing'
 
     def __init_subclass__(cls) -> None:
@@ -1482,8 +1481,7 @@ def __instancecheck__(self, __instance: Any) -> bool:
             return isinstance(__instance, typing.ParamSpec)
 
     class ParamSpec(metaclass=_ParamSpecMeta):
-        """Parameter specification."""
-
+        __doc__ = typing.ParamSpec.__doc__
         __module__ = 'typing'
 
         def __init_subclass__(cls) -> None:
@@ -2106,8 +2104,7 @@ def __instancecheck__(self, __instance: Any) -> bool:
             return isinstance(__instance, typing.TypeVarTuple)
 
     class TypeVarTuple(metaclass=_TypeVarTupleMeta):
-        """Type variable tuple."""
-
+        __doc__ = typing.TypeVarTuple.__doc__
         __module__ = 'typing'
 
         def __init_subclass__(self, *args, **kwds):