assistant: Add docs provider for `docs.rs` (#14356)

This PR adds an indexed docs provider for retrieving docs from `docs.rs`
using the `/docs` slash command.

Release Notes:

- N/A
ca80343486Marshall Bowers committed on 7/12/2024, 5:22:52 PM· committed by GitHubparent739038d
3 files changedLine totals unavailable