Resolve "Add link to Jenkins integration page"

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

 %h3.page-title
   = @service.title
 
-%p #{@service.description} template
+%p #{@service.description} template.
 
 = form_for :service, url: admin_application_settings_service_path, method: :put, html: { class: 'fieldset-form' } do |form|
   = render 'shared/service_settings', form: form, subject: @service

app/views/projects/services/_form.html.haml

@@ -4,7 +4,7 @@
       = @service.title
       = boolean_to_icon @service.activated?
 
-    %p= @service.description
+    %p= #{@service.description}.
 
     - if @service.respond_to?(:detailed_description)
       %p= @service.detailed_description

ee/app/models/project_services/jenkins_service.rb

@@ -65,7 +65,7 @@ class JenkinsService < CiService
   end
 
   def help
-    'You must have installed the Git Plugin and GitLab Plugin in Jenkins'
+    "You must have installed the Git Plugin and GitLab Plugin in Jenkins. [More information](#{Gitlab::Routing.url_helpers.help_page_url('integration/jenkins')})"
   end
 
   def self.to_param

ee/changelogs/unreleased/5903-add-jenkins-ci-doc-link.yml

+---
+title: Add link to Jenkins documentation within integration and service template
+merge_request:
+author:
+type: added