Rollup merge of rust-lang#143970 - SunkenPotato:update_mem_copy_docs, r=scottmcm

Update core::mem::copy documentation

Update the documentation of `core::mem::copy` to include a `const` on the definition of the function.

Author: fmease

library/core/src/mem/mod.rs

@@ -960,7 +960,7 @@ pub fn drop<T>(_x: T) {}
 ///
 /// This function is not magic; it is literally defined as
 /// ```
-/// pub fn copy<T: Copy>(x: &T) -> T { *x }
+/// pub const fn copy<T: Copy>(x: &T) -> T { *x }
 /// ```
 ///
 /// It is useful when you want to pass a function pointer to a combinator, rather than defining a new closure.