Tracking issue for release notes of #152304: stabilize new RangeToInclusive type

[rustbot]

This issue tracks the release notes text for #152304.

cc @pitaj, @tgross35 -- original issue/PR authors and assignees for drafting text

See the forge.rust-lang.org chapter about release notes for an overview of how the release team makes use of these tracking issues.

Release notes text

This section should be edited to specify the correct category(s) for the change, with succinct description(s) of what changed. Some things worth considering:

• Does this need an additional compat notes section?
• Was this a libs stabilization that should have additional headers to list new APIs under Stabilized APIs and Const Stabilized APIs?

# Stabilized APIs
- [`core::range::RangeToInclusive`](https://doc.rust-lang.org/stable/core/range/struct.RangeToInclusive.html)
- [`core::range::RangeToInclusiveIter`](https://doc.rust-lang.org/stable/core/range/struct.RangeToInclusiveIter.html)

Tip

Use the previous releases for inspiration on how to write the release notes text and which categories to pick.

Release blog section

See #154622 for the shared blog post.