Use UnorderedElementsAre in example about using matchers with maps

PiperOrigin-RevId: 473353707
Change-Id: Ief5bdbd2b8e28bac8f47be9aaeac4bb93875a793

docs/gmock_cook_book.md

@@ -1424,11 +1424,12 @@ Use `Pair` when comparing maps or other associative containers.
 {% raw %}
 
 ```cpp
-using testing::ElementsAre;
-using testing::Pair;
+using ::testing::UnorderedElementsAre;
+using ::testing::Pair;
 ...
-  std::map<string, int> m = {{"a", 1}, {"b", 2}, {"c", 3}};
-  EXPECT_THAT(m, ElementsAre(Pair("a", 1), Pair("b", 2), Pair("c", 3)));
+  absl::flat_hash_map<string, int> m = {{"a", 1}, {"b", 2}, {"c", 3}};
+  EXPECT_THAT(m, UnorderedElementsAre(
+      Pair("a", 1), Pair("b", 2), Pair("c", 3)));
 ```
 
 {% endraw %}
@@ -1445,8 +1446,8 @@ using testing::Pair;
 *   If the container is passed by pointer instead of by reference, just write
     `Pointee(ElementsAre*(...))`.
 *   The order of elements *matters* for `ElementsAre*()`. If you are using it
-    with containers whose element order are undefined (e.g. `hash_map`) you
-    should use `WhenSorted` around `ElementsAre`.
+    with containers whose element order are undefined (such as a
+    `std::unordered_map`) you should use `UnorderedElementsAre`.
 
 ### Sharing Matchers