Remove assistant hints (#21171)

This reverts #20824 and #20899. After adding them last week we came to
the conclusion that the hints are too distracting in everyday use, see
#21128 for more details.

Release Notes:

- N/A

crates/recent_projects/src/recent_projects.rs

@@ -172,13 +172,13 @@ impl PickerDelegate for RecentProjectsDelegate {
     fn placeholder_text(&self, cx: &mut WindowContext) -> Arc<str> {
         let (create_window, reuse_window) = if self.create_new_window {
             (
-                cx.keystroke_text_for_action(&menu::Confirm),
-                cx.keystroke_text_for_action(&menu::SecondaryConfirm),
+                cx.keystroke_text_for(&menu::Confirm),
+                cx.keystroke_text_for(&menu::SecondaryConfirm),
             )
         } else {
             (
-                cx.keystroke_text_for_action(&menu::SecondaryConfirm),
-                cx.keystroke_text_for_action(&menu::Confirm),
+                cx.keystroke_text_for(&menu::SecondaryConfirm),
+                cx.keystroke_text_for(&menu::Confirm),
             )
         };
         Arc::from(format!(