Rollup merge of #94818 - yoshuawuyts:into-future-associated-type, r=joshtriplett

Rename `IntoFuture::Future` to `IntoFuture::IntoFuture`

Ref: https://github.com/rust-lang/rust/issues/67644#issuecomment-1051401459

This renames `IntoFuture::Future` to `IntoFuture::IntoFuture`. This adds the `Into*` prefix to the associated type, similar to the [`IntoIterator::IntoIter`](https://doc.rust-lang.org/std/iter/trait.IntoIterator.html#associatedtype.IntoIter) associated type. It's my mistake we didn't do so in the first place. This fixes that and brings the two closer together. Thanks!

### References
__`IntoIterator` trait def__
```rust
pub trait IntoIterator {
    type Item;
    type IntoIter: Iterator<Item = Self::Item>;
    fn into_iter(self) -> Self::IntoIter;
}
```
__`IntoFuture` trait def__
```rust
pub trait IntoFuture {
    type Output;
    type IntoFuture: Future<Output = Self::Output>; // Prior to this PR: `type Future:`
    fn into_future(self) -> Self::IntoFuture;
}
```

cc/ `@eholk` `@rust-lang/wg-async`

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