Polish actions macros

crates/menu2/src/menu2.rs

@@ -1,9 +1,10 @@
 use gpui::actions;
 
-// todo!(remove this)
+// If the zed binary doesn't use anything in this crate, it will be optimized out
+// and the actions won't initialize. So we just call an empty initialization function.
 // https://github.com/rust-lang/rust/issues/47384
 // https://github.com/mmastrac/rust-ctor/issues/280
-pub fn unused() {}
+pub fn init() {}
 
 actions!(
     Cancel,