"When is Bottlerocket finished booting?"

**Path to page with content (_do not_ include domain name):**
`/en/faq/`

**What content is incorrect?**

A fairly common question (or argument) is when Bottlerocket "finishes" booting. It's confounded by things like boostrap containers.

**What should the content say or communicate?**

This should be a FAQ item. The answer should be a generic, variant-independent answer (`preconfigured.target`) as well as more practical one, where bottlerocket becomes 'useful' (`multi-user.target`).

Start with the source for the `/en/faq/` page and review its existing FAQ structure and terminology. Add an item explaining both the generic `preconfigured.target` completion point and the practical `multi-user.target` point, including the bootstrap-container context. Done means the FAQ clearly answers when Bottlerocket is finished booting without depending on a variant.

Written by the indexing model from the issue text.