Remove paragraph mentioning minor edits through the mailing list (#1891)

Author: Viicos

docs/spec/dataclasses.rst

@@ -192,11 +192,6 @@ customization of default behaviors:
   in ``typing.py``. Type checkers should report errors for any
   unrecognized parameters.
 
-In the future, we may add additional parameters to
-``dataclass_transform`` as needed to support common behaviors in user
-code. These additions will be made after reaching consensus on
-typing-sig rather than via additional PEPs.
-
 The following sections provide additional examples showing how these
 parameters are used.