Merge branch 'Jenkins_Integration_Mktg_Docs_Page_Update_20190729' into 'master'

Update jenkins.md - add CTA to about.gitlab page

See merge request gitlab-org/gitlab-ce!31259

doc/integration/jenkins.md

@@ -35,6 +35,9 @@ and [Migrating from Jenkins to GitLab](https://www.youtube.com/watch?v=RlEVGOpYF
 
 For a real use case, read the blog post [Continuous integration: From Jenkins to GitLab using Docker](https://about.gitlab.com/2017/07/27/docker-my-precious/).
 
+NOTE: **Moving from a traditional CI plug-in to a single application for the entire software development lifecycle can decrease hours spent on maintaining toolchains by 10% or more.** 
+Visit the ['GitLab vs. Jenkins' comparison page](https://about.gitlab.com/devops-tools/jenkins-vs-gitlab.html) to learn how our built-in CI compares to Jenkins.
+
 ## Requirements
 
 - [Jenkins GitLab Plugin](https://wiki.jenkins.io/display/JENKINS/GitLab+Plugin)