Rollup merge of #98039 - tnballo:master, r=thomcc

Fix `panic` message for `BTreeSet`'s `range` API and document `panic` cases

Currently, the `panic` cases for [`BTreeSet`'s `range` API](https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.range) are undocumented and produce a slightly wrong `panic` message (says `BTreeMap` instead of `BTreeSet`).

Panic case 1 code:

```rust
use std::collections::BTreeSet;
use std::ops::Bound::Excluded;

fn main() {
    let mut set = BTreeSet::new();
    set.insert(3);
    set.insert(5);
    set.insert(8);

    for &elem in set.range((Excluded(&3), Excluded(&3))) {
        println!("{elem}");
    }
}
```

Panic case 1 message:

```
thread 'main' panicked at 'range start and end are equal and excluded in BTreeMap', /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/alloc/src/collections/btree/search.rs:105:17
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```

Panic case 2 code:

```rust
use std::collections::BTreeSet;
use std::ops::Bound::Included;

fn main() {
    let mut set = BTreeSet::new();
    set.insert(3);
    set.insert(5);
    set.insert(8);

    for &elem in set.range((Included(&8), Included(&3))) {
        println!("{elem}");
    }
}
```

Panic case 2:

```
thread 'main' panicked at 'range start is greater than range end in BTreeMap', /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/alloc/src/collections/btree/search.rs:110:17
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```

This PR fixes the output messages to say `BTreeSet`, adds the relevant unit tests, and updates the documentation for the API.

0 files changed, 0 insertions, 0 deletions