Migration: mention the removal of `.rounded-sm/lg` utilities (#32758)

Migration: mention the removal of `.rounded-sm/lg` utilities (#32758)

* Changes made in migration.md file of documentation

Added information about the removal of `.rounded-sm` and `.rounded-lg`.
And addition of `.rounded-0` to `.rounded-3`

* Moved the edited line

Added `rounded-0` to `rounded-3` under  v5.0.0-alpha3

* Moved correctly

* Added link

Added link to issue #31687

* docs(migration): last typo thinggies

* Update migration.md

Co-authored-by: Gaël Poupard <ffoodd@users.noreply.github.com>
Co-authored-by: XhmikosR <xhmikosr@gmail.com>