diff --git a/library/alloc/src/collections/btree/map.rs b/library/alloc/src/collections/btree/map.rs
index ff908ec12ec8..29e9423bb436 100644
--- a/library/alloc/src/collections/btree/map.rs
+++ b/library/alloc/src/collections/btree/map.rs
@@ -613,8 +613,6 @@ impl<K, V> BTreeMap<K, V> {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -636,8 +634,6 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -661,8 +657,6 @@ pub fn clear(&mut self) {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// # #![feature(allocator_api)]
     /// # #![feature(btreemap_alloc)]
@@ -688,8 +682,6 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -744,8 +736,6 @@ pub fn get_key_value<Q: ?Sized>(&self, k: &Q) -> Option<(&K, &V)>
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -830,8 +820,6 @@ pub fn pop_first(&mut self) -> Option<(K, V)>
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -917,8 +905,6 @@ pub fn pop_last(&mut self) -> Option<(K, V)>
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -943,8 +929,6 @@ pub fn contains_key<Q: ?Sized>(&self, key: &Q) -> bool
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -982,8 +966,6 @@ pub fn get_mut<Q: ?Sized>(&mut self, key: &Q) -> Option<&mut V>
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -1017,8 +999,6 @@ pub fn insert(&mut self, key: K, value: V) -> Option<V>
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// #![feature(map_try_insert)]
     ///
@@ -1051,8 +1031,6 @@ pub fn try_insert(&mut self, key: K, value: V) -> Result<&mut V, OccupiedError<'
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -1078,8 +1056,6 @@ pub fn remove<Q: ?Sized>(&mut self, key: &Q) -> Option<V>
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -1208,8 +1184,6 @@ pub fn append(&mut self, other: &mut Self)
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     /// use std::ops::Bound::Included;
@@ -1251,8 +1225,6 @@ pub fn range<T: ?Sized, R>(&self, range: R) -> Range<'_, K, V>
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -1283,8 +1255,6 @@ pub fn range_mut<T: ?Sized, R>(&mut self, range: R) -> RangeMut<'_, K, V>
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -1336,8 +1306,6 @@ pub fn entry(&mut self, key: K) -> Entry<'_, K, V, A>
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -2388,8 +2356,6 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -2420,8 +2386,6 @@ pub fn iter(&self) -> Iter<'_, K, V> {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -2453,8 +2417,6 @@ pub fn iter_mut(&mut self) -> IterMut<'_, K, V> {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -2474,8 +2436,6 @@ pub fn keys(&self) -> Keys<'_, K, V> {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -2495,8 +2455,6 @@ pub fn values(&self) -> Values<'_, K, V> {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -2521,8 +2479,6 @@ pub fn values_mut(&mut self) -> ValuesMut<'_, K, V> {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -2546,8 +2502,6 @@ pub const fn len(&self) -> usize {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// use std::collections::BTreeMap;
     ///
@@ -2578,8 +2532,6 @@ pub const fn is_empty(&self) -> bool {
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// #![feature(btree_cursors)]
     ///
@@ -2619,8 +2571,6 @@ pub fn lower_bound<Q>(&self, bound: Bound<&Q>) -> Cursor<'_, K, V>
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// #![feature(btree_cursors)]
     ///
@@ -2673,8 +2623,6 @@ pub fn lower_bound_mut<Q>(&mut self, bound: Bound<&Q>) -> CursorMut<'_, K, V, A>
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// #![feature(btree_cursors)]
     ///
@@ -2714,8 +2662,6 @@ pub fn upper_bound<Q>(&self, bound: Bound<&Q>) -> Cursor<'_, K, V>
     ///
     /// # Examples
     ///
-    /// Basic usage:
-    ///
     /// ```
     /// #![feature(btree_cursors)]
     ///