gh-91860: documentation for typing.dataclass_transform (GH-92768) Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com> (cherry picked from commit f20a6a54fb041507a334ad71706974960d1b473f) Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>