Update library/core/src/primitive_docs.rs

fold line together

Co-authored-by: Jubilee <workingjubilee@gmail.com>

Author: lolbinarycat

library/core/src/primitive_docs.rs

@@ -834,8 +834,7 @@ mod prim_array {}
 #[doc(alias = "[]")]
 /// A dynamically-sized view into a contiguous sequence, `[T]`.
 ///
-/// Contiguous here
-/// means that elements are laid out so that every element is the same
+/// Contiguous here means that elements are laid out so that every element is the same
 /// distance from its neighbors.
 ///
 /// *[See also the `std::slice` module](crate::slice).*