try to clarify wording

library/core/src/ptr/mod.rs

@@ -795,10 +795,9 @@ pub const fn slice_from_raw_parts_mut<T>(data: *mut T, len: usize) -> *mut [T] {
 ///
 /// Behavior is undefined if any of the following conditions are violated:
 ///
-/// * Both `x` and `y` must be [valid] for both reads and writes.
-///
-/// * `x` must remain valid for reads and writes even after `y` is read/written, and vice versa.
-///   (In other words, there cannot be aliasing restrictions on the use of these pointers.)
+/// * Both `x` and `y` must be [valid] for both reads and writes. They must remain valid even if the
+///   other pointer is written. (This means if the memory ranges overlap, the two pointers must not
+///   be subject to aliasing restrictions relative to each other.)
 ///
 /// * Both `x` and `y` must be properly aligned.
 ///