Change bottom margin on title

changelogs/unreleased/mw-cr-title-margin.yml

+---
+title: 'Code review analytics: Change margin between title and description'
+merge_request: 30834
+author:
+type: changed

ee/app/views/projects/analytics/code_reviews/index.html.haml

@@ -2,7 +2,7 @@
 - page_title _("Code Review")
 
 .mb-3
-  %h3
+  %h3.mb-2
     = _('Code Review')
   %span.text-secondary= _('Review time is defined as the time it takes from first comment until merged.')
 - if Feature.disabled?(:code_review_analytics_has_new_search)