Add disclaimer for outdated jira server integration docs (#11841)

* Add disclaimer for outdated jira server integration docs

* Update docs/organization/integrations/issue-tracking/jira/index.mdx

Co-authored-by: Liza Mock <[email protected]>

---------

Co-authored-by: Alex Krawiec <[email protected]>
Co-authored-by: Liza Mock <[email protected]>

Author: 3 people

docs/organization/integrations/issue-tracking/jira/index.mdx

@@ -30,6 +30,12 @@ Jira should now be authorized for all projects under your Sentry organization.
 
 ### Jira Server
 
+<Note>
+
+As of February 2024, Jira has discontinued support for Jira Server. Accordingly, we have stopped maintaining the docs for this integration. The instructions below may be out of date.
+
+</Note>
+
 Sentry's Jira Server Integration is built using [Application Links](https://confluence.atlassian.com/adminjiraserver/link-to-other-applications-938846918.html) and should be able to integrate with Jira Data Center as well.
 
 #### Generate an RSA public/private key pair