Rollup merge of #134310 - tkr-sh:master, r=Noratrieb

Add clarity to the examples of some `Vec` & `VecDeque` methods

In some `Vec` and `VecDeque` examples where elements are `i32`, examples can seem a bit confusing at first glance if a parameter of the method is an `usize`.

In this case, I think it's better to use `char` rather than `i32`.

> [!NOTE]
> It's already done in the implementation of `VecDeque::insert`

#### Difference

- `i32`
```rs
let mut v = vec![1, 2, 3];
assert_eq!(v.remove(1), 2);
assert_eq!(v, [1, 3]);
```
- `char`
```rs
let mut v = vec!['a', 'b', 'c'];
assert_eq!(v.remove(1), 'b');
assert_eq!(v, ['a', 'c']);
```

Even tho it's pretty minor, it's a nice to have.

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