[3.12] Docs: mark up FTP.connect() and FTP.login() with param lists (GH-114395) (#114485)

Use rst substitutions to reduce raw text duplication.

(cherry picked from commit 01105c7c4f7f01a8b1077008e61d5c7df0ab832b)

Co-authored-by: Erlend E. Aasland <erlend@python.org>
Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>