Rollup merge of rust-lang#151005 - pr_doc_maybeuninit_typo, r=joboet

Fix typo in `MaybeUninit` docs

–- → – (extra ASCII minus after endash)

Introduced in rust-lang#140463 (11627f0).

Author: JonathanBrouwer

library/core/src/mem/maybe_uninit.rs

@@ -256,7 +256,7 @@ use crate::{fmt, intrinsics, ptr, slice};
 ///
 /// # Validity
 ///
-/// `MaybeUninit<T>` has no validity requirements –- any sequence of [bytes] of
+/// `MaybeUninit<T>` has no validity requirements – any sequence of [bytes] of
 /// the appropriate length, initialized or uninitialized, are a valid
 /// representation.
 ///