fix intra-doc links

Author: ripytide

library/alloc/src/collections/btree/map.rs

@@ -2561,6 +2561,8 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> {
     /// assert_eq!(cursor.peek_prev(), None);
     /// assert_eq!(cursor.peek_next(), Some((&1, &"a")));
     /// ```
+    ///
+    /// [`Bound`]: core::ops::Bound
     #[unstable(feature = "btree_cursors", issue = "107540")]
     pub fn lower_bound<Q: ?Sized>(&self, bound: Bound<&Q>) -> Cursor<'_, K, V>
     where
@@ -2614,6 +2616,8 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> {
     /// assert_eq!(cursor.peek_prev(), None);
     /// assert_eq!(cursor.peek_next(), Some((&1, &mut "a")));
     /// ```
+    ///
+    /// [`Bound`]: core::ops::Bound
     #[unstable(feature = "btree_cursors", issue = "107540")]
     pub fn lower_bound_mut<Q: ?Sized>(&mut self, bound: Bound<&Q>) -> CursorMut<'_, K, V, A>
     where
@@ -2684,6 +2688,8 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> {
     /// assert_eq!(cursor.peek_prev(), Some((&4, &"d")));
     /// assert_eq!(cursor.peek_next(), None);
     /// ```
+    ///
+    /// [`Bound`]: core::ops::Bound
     #[unstable(feature = "btree_cursors", issue = "107540")]
     pub fn upper_bound<Q: ?Sized>(&self, bound: Bound<&Q>) -> Cursor<'_, K, V>
     where
@@ -2737,6 +2743,8 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> {
     /// assert_eq!(cursor.peek_prev(), Some((&4, &mut "d")));
     /// assert_eq!(cursor.peek_next(), None);
     /// ```
+    ///
+    /// [`Bound`]: core::ops::Bound
     #[unstable(feature = "btree_cursors", issue = "107540")]
     pub fn upper_bound_mut<Q: ?Sized>(&mut self, bound: Bound<&Q>) -> CursorMut<'_, K, V, A>
     where