Make the comment better

Author: tiif

compiler/rustc_trait_selection/src/traits/misc.rs

@@ -147,7 +147,7 @@ pub fn type_allowed_to_implement_const_param_ty<'tcx>(
         let infcx = tcx.infer_ctxt().build(TypingMode::non_body_analysis());
         let ocx = traits::ObligationCtxt::new_with_diagnostics(&infcx);
 
-        // Make sure certain types are gated with #[unstable_feature_bound(unsized_const_params)]
+        // Make sure impls certain types are gated with #[unstable_feature_bound(unsized_const_params)]
         if need_unstable_feature_bound {
             ocx.register_obligation(Obligation::new(
                 tcx,