Remove a mention to copy_from_slice from clone_from_slice doc

JohnTitor · JohnTitor · commit 1df185ac02c5 · 2021-10-16T17:30:34.000+09:00
diff --git a/library/core/src/slice/mod.rs b/library/core/src/slice/mod.rs
@@ -2953,9 +2953,6 @@ impl<T> [T] {
     ///
     /// The length of `src` must be the same as `self`.
     ///
-    /// If `T` implements `Copy`, it can be more performant to use
-    /// [`copy_from_slice`].
-    ///
     /// # Panics
     ///
     /// This function will panic if the two slices have different lengths.
