docs: fix incorrect stability markers on std::{todo, matches}

This regression appeared in 916cfbc.
The change is behaving as expected (a non-glob re-export uses the
stability marker on the `use` item, not the original one), but
this part of the standard library didn't follow it.

Author: notriddle

library/std/src/lib.rs

@@ -704,8 +704,14 @@ pub use core::cfg_match;
     reason = "`concat_bytes` is not stable enough for use and is subject to change"
 )]
 pub use core::concat_bytes;
+#[stable(feature = "matches_macro", since = "1.42.0")]
+#[allow(deprecated, deprecated_in_future)]
+pub use core::matches;
 #[stable(feature = "core_primitive", since = "1.43.0")]
 pub use core::primitive;
+#[stable(feature = "todo_macro", since = "1.40.0")]
+#[allow(deprecated, deprecated_in_future)]
+pub use core::todo;
 // Re-export built-in macros defined through core.
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
 #[allow(deprecated)]
@@ -719,8 +725,8 @@ pub use core::{
 #[stable(feature = "rust1", since = "1.0.0")]
 #[allow(deprecated, deprecated_in_future)]
 pub use core::{
-    assert_eq, assert_ne, debug_assert, debug_assert_eq, debug_assert_ne, matches, todo, r#try,
-    unimplemented, unreachable, write, writeln,
+    assert_eq, assert_ne, debug_assert, debug_assert_eq, debug_assert_ne, r#try, unimplemented,
+    unreachable, write, writeln,
 };
 
 // Include a number of private modules that exist solely to provide