Add rustc_confusables annotations to some stdlib APIs

Help with common API confusion, like asking for `push` when the data structure really has `append`.

```
error[E0599]: no method named `size` found for struct `Vec<{integer}>` in the current scope
  --> $DIR/rustc_confusables_std_cases.rs:17:7
   |
LL |     x.size();
   |       ^^^^
   |
help: you might have meant to use `len`
   |
LL |     x.len();
   |       ~~~
help: there is a method with a similar name
   |
LL |     x.resize();
   |       ~~~~~~
```

#59450

library/proc_macro/src/bridge/scoped_cell.rs

@@ -25,6 +25,7 @@ impl<T: LambdaL> ScopedCell<T> {
     /// running `f`, which gets the old value, mutably.
     /// The old value will be restored after `f` exits, even
     /// by panic, including modifications made to it by `f`.
+    #[rustc_confusables("swap")]
     pub fn replace<'a, R>(
         &self,
         replacement: <T as ApplyL<'a>>::Out,