Revert "Resolve documentation for visible completions (#21705)" (#21985)

This reverts commit ab595b0d55.

Release Notes:

- (preview only) Fixed a panic in completions

crates/editor/src/editor.rs

@@ -3736,7 +3736,7 @@ impl Editor {
 
                     if editor.focus_handle.is_focused(cx) && menu.is_some() {
                         let mut menu = menu.unwrap();
-                        menu.resolve_visible_completions(editor.completion_provider.as_deref(), cx);
+                        menu.resolve_selected_completion(editor.completion_provider.as_deref(), cx);
                         *context_menu = Some(CodeContextMenu::Completions(menu));
                         drop(context_menu);
                         cx.notify();