fix: overlay positioning for v3 submenus (aka non viewport containers) (#9343)
* fix: v3 submenu positioning in the docs
* update comment for clarity
* Revert "fix: meu unavailable items (#9583)"
This reverts commit bdec15cc4dae40f222bef57f2b51ac94a7ea022c.
* Revert "fix: v3 menus alternative approach (#9345)"
This reverts commit 3ad9c26ea3aa31787c9b0cb3a03087b0812f0c68.
* remove menu copy of useOverlayPosition