Merge branch 'pawel/fix_link_to_prometheus_docs-33921' into 'master'

Fix Prometheus application settings help link to point to Prometheus help page

Closes #33921

See merge request !13258

app/views/admin/application_settings/_form.html.haml

@@ -322,7 +322,7 @@
       \. This setting requires a
       = link_to 'restart', help_page_path('administration/restart_gitlab')
       to take effect.
-      = link_to icon('question-circle'), help_page_path('administration/monitoring/performance/introduction')
+      = link_to icon('question-circle'), help_page_path('administration/monitoring/prometheus/index')
     .form-group
       .col-sm-offset-2.col-sm-10
         .checkbox