Rollup merge of rust-lang#79358 - ssomers:btree_public_comments, r=Mark-Simulacrum

BTreeMap/BTreeSet: make public doc more consistent

Tweaks rust-lang#72876 and rust-lang#73667 and propagate them to `BTreeSet`.

Author: Dylan-DPC

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

@@ -458,7 +458,7 @@ impl<K: fmt::Debug, V: fmt::Debug> fmt::Debug for RangeMut<'_, K, V> {
 }
 
 impl<K: Ord, V> BTreeMap<K, V> {
-    /// Makes a new empty BTreeMap.
+    /// Makes a new, empty `BTreeMap`.
     ///
     /// Does not allocate anything on its own.
     ///
@@ -1924,7 +1924,7 @@ impl<K: Hash, V: Hash> Hash for BTreeMap<K, V> {
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<K: Ord, V> Default for BTreeMap<K, V> {
-    /// Creates an empty `BTreeMap<K, V>`.
+    /// Creates an empty `BTreeMap`.
     fn default() -> BTreeMap<K, V> {
         BTreeMap::new()
     }

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

@@ -220,7 +220,9 @@ impl<T: fmt::Debug> fmt::Debug for Union<'_, T> {
 const ITER_PERFORMANCE_TIPPING_SIZE_DIFF: usize = 16;
 
 impl<T: Ord> BTreeSet<T> {
-    /// Makes a new `BTreeSet` with a reasonable choice of B.
+    /// Makes a new, empty `BTreeSet`.
+    ///
+    /// Does not allocate anything on its own.
     ///
     /// # Examples
     ///
@@ -1121,7 +1123,7 @@ impl<'a, T: 'a + Ord + Copy> Extend<&'a T> for BTreeSet<T> {
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: Ord> Default for BTreeSet<T> {
-    /// Makes an empty `BTreeSet<T>` with a reasonable choice of B.
+    /// Creates an empty `BTreeSet`.
     fn default() -> BTreeSet<T> {
         BTreeSet::new()
     }