bpo-43558: Add note about base class initialization to dataclasses doc (GH-25967) (GH-26018)

(cherry picked from commit 2a031723eefcf6f1d678bbb4f6018610d43623c4)

Co-authored-by: dhoekstra2000 <douwe.hoekstra2512@gmail.com>

Co-authored-by: dhoekstra2000 <douwe.hoekstra2512@gmail.com>
3 files changed