Rollup merge of rust-lang#128310 - kmicklas:btree-map-peek-next-docs,…

… r=tgross35

Add missing periods on `BTreeMap` cursor `peek_next` docs

Tracking issue: rust-lang#107540

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

@@ -2921,7 +2921,7 @@ impl<'a, K, V> Cursor<'a, K, V> {
  /// Returns a reference to the key and value of the next element without
  /// moving the cursor.
  ///
- /// If the cursor is at the end of the map then `None` is returned
+ /// If the cursor is at the end of the map then `None` is returned.
  #[unstable(feature = "btree_cursors", issue = "107540")]
  pub fn peek_next(&self) -> Option<(&'a K, &'a V)> {
  self.clone().next()
@@ -2963,7 +2963,7 @@ impl<'a, K, V, A> CursorMut<'a, K, V, A> {
  /// Returns a reference to the key and value of the next element without
  /// moving the cursor.
  ///
- /// If the cursor is at the end of the map then `None` is returned
+ /// If the cursor is at the end of the map then `None` is returned.
  #[unstable(feature = "btree_cursors", issue = "107540")]
  pub fn peek_next(&mut self) -> Option<(&K, &mut V)> {
  let (k, v) = self.inner.peek_next()?;
@@ -3061,7 +3061,7 @@ impl<'a, K, V, A> CursorMutKey<'a, K, V, A> {
  /// Returns a reference to the key and value of the next element without
  /// moving the cursor.
  ///
- /// If the cursor is at the end of the map then `None` is returned
+ /// If the cursor is at the end of the map then `None` is returned.
  #[unstable(feature = "btree_cursors", issue = "107540")]
  pub fn peek_next(&mut self) -> Option<(&mut K, &mut V)> {
  let current = self.current.as_mut()?;