Update domain for issues.jenkins.io in PR template
@@ -3,7 +3,7 @@ A great PR typically begins with the line below.
Replace XXXXX with the numeric part of the issue's id you created on JIRA.
Please note that if you want your changes backported into LTS, you will need to create a JIRA ticket for it. Read https://www.jenkins.io/download/lts/#backporting-process for more.
-->
-See [JENKINS-XXXXX](https://issues.jenkins-ci.org/browse/JENKINS-XXXXX).
+See [JENKINS-XXXXX](https://issues.jenkins.io/browse/JENKINS-XXXXX).
<!-- Comment:
If the issue is not fully described in the ticket, add more information here (justification, pull request links, etc.).
