Merge branch 'docs-introduced-links' into 'master'

Fixing "introduced in GitLab (version)" links

Closes gitlab-ce#48147

See merge request gitlab-org/gitlab-ee!6201

doc/install/pivotal/index.md

@@ -21,7 +21,7 @@ and click a button to begin the upgrade process.
 
 ## Features
 
-The GitLab Pivotal Tile is based on [GitLab Premium] and includes nearly all of its features. The features in Premium but _not_ supported on the Tile are:
+The GitLab Pivotal Tile is based on [GitLab Premium][eep] and includes nearly all of its features. The features in Premium but _not_ supported on the Tile are:
 
 * PostgreSQL
 * Pages
@@ -41,5 +41,5 @@ website:
 - [Product page](https://network.pivotal.io/products/p-gitlab/)
 - [Documentation](https://docs.pivotal.io/partners/gitlab/index.html)
 
-[premium]: https://about.gitlab.com/products/
+[eep]: https://about.gitlab.com/products/
 [pcf]: https://pivotal.io/platform

doc/integration/jira_development_panel.md

@@ -102,5 +102,5 @@ Click the links to see your GitLab repository data.
 [existing-jira]: ../user/project/integrations/jira.md
 [jira-development-panel]: https://confluence.atlassian.com/adminjiraserver070/integrating-with-development-tools-776637096.html#Integratingwithdevelopmenttools-Developmentpanelonissues
 [eep]: https://about.gitlab.com/products/
-[ee-2786]: https://gitlab.com/gitlab-org/gitlab-ee/issues/2786
+[ee-2381]: https://gitlab.com/gitlab-org/gitlab-ee/issues/2381
 [relative-url]: https://docs.gitlab.com/omnibus/settings/configuration.html#configuring-a-relative-url-for-gitlab