Rollup merge of rust-lang#120783 - integer32llc:improve-release-notes, r=Mark-Simulacrum

Add release note for new ambiguous_wide_pointer_comparisons lint

I found out about this new lint in Rust because I had code allowing the Clippy lint. Clippy alerted me to the lint name change, and I went searching for the new lint's name in the release notes and was surprised there wasn't an item for it.

Author: matthiaskrgr

RELEASES.md

@@ -8,6 +8,7 @@ Language
 - [Document Rust ABI compatibility between various types](https://github.com/rust-lang/rust/pull/115476/)
 - [Also: guarantee that char and u32 are ABI-compatible](https://github.com/rust-lang/rust/pull/118032/)
 - [Warn against ambiguous wide pointer comparisons](https://github.com/rust-lang/rust/pull/117758/)
+- [Add lint `ambiguous_wide_pointer_comparisons` that supersedes `clippy::vtable_address_comparisons`](https://github.com/rust-lang/rust/pull/117758)
 
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