Add 2021/22 lettings log to collection resources list

app/views/layouts/_collection_resources.html.erb

@@ -1,9 +1,13 @@
 <div class="app-card">
-  <h2 class="govuk-heading-s">2022/23 collection resources</h2>
+  <h2 class="govuk-heading-s">Collection resources</h2>
 
   <%= render DocumentListComponent.new(items: [{
-    name: "Lettings log for tenants",
+    name: "Lettings log for tenants (2022/23)",
     href: "https://core.communities.gov.uk/public/download/guides-and-manuals/2022-23%20Lettings%20paper%20form.pdf?download-format=pdf",
     metadata: "PDF, 654 KB, 4 pages"
+  }, {
+    name: "Lettings log for tenants (2021/22)",
+    href: "https://core.communities.gov.uk/public/download/guides-and-manuals/2021_22%20Lettings%20Log.pdf?download-format=pdf",
+    metadata: "PDF, 302 KB, 3 pages"
   }]) %>
 </div>