std: Combine split point note and make_contiguous into one part

Signed-off-by: xizheyin <[email protected]>

Author: xizheyin

library/alloc/src/collections/vec_deque/mod.rs

@@ -1312,9 +1312,8 @@ impl<T, A: Allocator> VecDeque<T, A> {
     ///
     /// If [`make_contiguous`] was previously called, all elements of the
     /// deque will be in the first slice and the second slice will be empty.
-    ///
-    /// Note that the particular split point between the slices is not guaranteed
-    /// and may change based on internal implementation details.
+    /// Otherwise, the exact split point depends on implementation details
+    /// and is not guaranteed.
     ///
     /// [`make_contiguous`]: VecDeque::make_contiguous
     ///
@@ -1352,9 +1351,8 @@ impl<T, A: Allocator> VecDeque<T, A> {
     ///
     /// If [`make_contiguous`] was previously called, all elements of the
     /// deque will be in the first slice and the second slice will be empty.
-    ///
-    /// Note that the particular split point between the slices is not guaranteed
-    /// and may change based on internal implementation details.
+    /// Otherwise, the exact split point depends on implementation details
+    /// and is not guaranteed.
     ///
     /// [`make_contiguous`]: VecDeque::make_contiguous
     ///