[docs] Document headless Multiple values Autocomplete in Base UI

[oliviertassinari]

Summary 💡

Document headless Multiple values Autocomplete in Base UI.

Examples 🌈

I think that https://mui.com/material-ui/react-autocomplete/#customized-hook would be better in the Base UI's docs.

Motivation 🔦

When landing in https://mui.com/base/react-autocomplete/ the component feels limited in terms of features while it's feature rich. I saw this need from browsing: https://github.com/shadcn/ui/issues/66.

I think that it would be great to move as much as possible from https://mui.com/material-ui/react-autocomplete/ and https://mui.com/joy-ui/react-autocomplete/ to be present on Base UI docs instead.

[mnajdova]

This makes a lot of sense. The first iteration of adding this page was to enable us to show the hooks API information. We already talked with @mj12albert that we can extend it. @mj12albert I am assigning the issue to you.