docs: Adjust assistant configuration docs table of contents (#28099)

Follow up https://github.com/zed-industries/zed/pull/28088

The "Feature-specific models" was under the LM Studio section, which was
incorrect.

Release Notes:

- N/A
cfe5620a2aDanilo Leal committed on 4/4/2025, 3:47:52 PM· committed by GitHubparent5fe86f7
2 files changedLine totals unavailable