Improve dataclass docstring (gh-94686)

Lib/dataclasses.py

@@ -1193,19 +1193,18 @@ def _add_slots(cls, is_frozen, weakref_slot):
 def dataclass(cls=None, /, *, init=True, repr=True, eq=True, order=False,
               unsafe_hash=False, frozen=False, match_args=True,
               kw_only=False, slots=False, weakref_slot=False):
-    """Returns the same class as was passed in, with dunder methods
-    added based on the fields defined in the class.
+    """Add dunder methods based on the fields defined in the class.
 
     Examines PEP 526 __annotations__ to determine fields.
 
-    If init is true, an __init__() method is added to the class. If
-    repr is true, a __repr__() method is added. If order is true, rich
+    If init is true, an __init__() method is added to the class. If repr
+    is true, a __repr__() method is added. If order is true, rich
     comparison dunder methods are added. If unsafe_hash is true, a
-    __hash__() method function is added. If frozen is true, fields may
-    not be assigned to after instance creation. If match_args is true,
-    the __match_args__ tuple is added. If kw_only is true, then by
-    default all fields are keyword-only. If slots is true, an
-    __slots__ attribute is added.
+    __hash__() method is added. If frozen is true, fields may not be
+    assigned to after instance creation. If match_args is true, the
+    __match_args__ tuple is added. If kw_only is true, then by default
+    all fields are keyword-only. If slots is true, a new class with a
+    __slots__ attribute is returned.
     """
 
     def wrap(cls):