Add descriptions to trending features in admin UI (#17677)

app/views/admin/trends/links/index.html.haml

@@ -4,6 +4,10 @@
 - content_for :header_tags do
   = javascript_pack_tag 'admin', async: true, crossorigin: 'anonymous'
 
+%p= t('admin.trends.links.description_html')
+
+%hr.spacer/
+
 = form_tag admin_trends_links_path, method: 'GET', class: 'simple_form' do
   - Trends::PreviewCardFilter::KEYS.each do |key|
     = hidden_field_tag key, params[key] if params[key].present?

app/views/admin/trends/links/preview_card_providers/index.html.haml

@@ -4,6 +4,10 @@
 - content_for :header_tags do
   = javascript_pack_tag 'admin', async: true, crossorigin: 'anonymous'
 
+%p= t('admin.trends.preview_card_providers.description_html')
+
+%hr.spacer/
+
 .filters
   .filter-subset
     %strong= t('admin.tags.review')
@@ -17,7 +21,6 @@
       = fa_icon 'chevron-left fw'
       = t('admin.trends.links.title')
 
-
 %hr.spacer/
 
 = form_for(@form, url: batch_admin_trends_links_preview_card_providers_path) do |f|