Handle buffer diff base updates and file renames properly for SSH projects (#14989)

Release Notes:

- N/A

---------

Co-authored-by: Conrad <conrad@zed.dev>

crates/assistant/src/slash_command/docs_command.rs

@@ -24,7 +24,7 @@ impl DocsSlashCommand {
     pub const NAME: &'static str = "docs";
 
     fn path_to_cargo_toml(project: Model<Project>, cx: &mut AppContext) -> Option<Arc<Path>> {
-        let worktree = project.read(cx).worktrees().next()?;
+        let worktree = project.read(cx).worktrees(cx).next()?;
         let worktree = worktree.read(cx);
         let entry = worktree.entry_for_path("Cargo.toml")?;
         let path = ProjectPath {