Documentation update for Collection library landing page
Update for description text to the landing page.
Closes https://github.com/dart-lang/sdk/pull/48123
https://github.com/dart-lang/sdk/pull/48123
GitOrigin-RevId: b5188e806fb45a3e1fca5a909577ee586c85f5e7
Change-Id: I2ad19dd32f2829ff9e4f3cf48177f42e9cae7846
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/227461
Reviewed-by: Lasse Nielsen <lrn@google.com>
Commit-Queue: Lasse Nielsen <lrn@google.com>
diff --git a/sdk/lib/collection/collection.dart b/sdk/lib/collection/collection.dart
index ac592bd..499b781 100644
--- a/sdk/lib/collection/collection.dart
+++ b/sdk/lib/collection/collection.dart
@@ -8,6 +8,49 @@
/// ```dart
/// import 'dart:collection';
/// ```
+///
+/// ## Map
+/// A finite mapping from unique keys to their associated values.
+/// Allows efficient lookup of the value associated with a key, if any,
+/// and iterating through the individual keys and values of the map.
+/// The [Map] interface has a number of implementations, including the following:
+/// * [HashMap] is unordered, the order of iteration is not guaranteed.
+/// * [LinkedHashMap] iterates in key insertion order.
+/// * [SplayTreeMap] iterates the keys in sorted order.
+/// * [UnmodifiableMapView] is a wrapper, an unmodifiable [Map] view of another
+/// `Map`.
+///
+/// ## Set
+/// A collection of objects in which each object can occur only once.
+/// The [Set] interface has a number of implementations, including the following:
+/// * [HashSet] the order of the objects in the iterations is not guaranteed.
+/// * [LinkedHashSet] iterates the objects in insertion order.
+/// * [SplayTreeSet] iterates the objects in sorted order.
+/// * [UnmodifiableSetView] is a wrapper, an unmodifiable [Set] view of another
+/// `Set`.
+///
+/// ## Queue
+/// A queue is a sequence of elements that is intended to be modified,
+/// by adding or removing elements, only at its ends.
+/// Dart queues are *double ended* queues, which means that they can be
+/// accessed equally from either end, and can therefore be used
+/// to implement both stack and queue behavior.
+/// * [Queue] is the general interface for queues.
+/// * [ListQueue] is a list-based queue. Default implementation for [Queue].
+/// * [DoubleLinkedQueue] is a queue implementation based on a double-linked
+/// list.
+///
+/// ## List
+/// An indexable Sequence of objects. Objects can be accessed using their
+/// position, index, in the sequence. [List] is also called an "array" in other
+/// programming languages.
+/// * [UnmodifiableListView] is a wrapper, an unmodifiable [List] view of
+/// another `List`.
+///
+/// ## LinkedList
+/// [LinkedList] is a specialized double-linked list of elements that extends
+/// [LinkedListEntry]. Each element knows its own place in the linked list,
+/// as well as which list it is in.
/// {@category Core}
library dart.collection;
