Add docs for: [Form] remove deprecated date types options handling

[fabpot]

Q	A
Feature PR	symfony/symfony#31777
PR author(s)	@xabbuh

[xabbuh]

@javiereguiluz You already fixed this in #11621. 😄

[javiereguiluz]

I'm really sorry! There's so much activity that it's easy to forget about previous changes 😞