Rephrase refining_impl_trait note.

Co-authored-by: Travis Cross <[email protected]>

Author: Mark-Simulacrum

RELEASES.md

@@ -13,7 +13,7 @@ Language
 - [Enable debuginfo in macros, and stabilize `-C collapse-macro-debuginfo` and `#[collapse_debuginfo]`.](https://github.com/rust-lang/rust/pull/120845/)
 - [Propagate temporary lifetime extension into `if` and `match` expressions.](https://github.com/rust-lang/rust/pull/121346/)
 - [Restrict promotion of `const fn` calls.](https://github.com/rust-lang/rust/pull/121557/)
-- [Split `refining_impl_trait` lint into `_reachable`, `_internal` variants.](https://github.com/rust-lang/rust/pull/121720/)
+- [Warn against refining impls of crate-private traits with `refining_impl_trait` lint.](https://github.com/rust-lang/rust/pull/121720/)
 - [Stabilize associated type bounds (RFC 2289).](https://github.com/rust-lang/rust/pull/122055/)
 
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