Spell out first use of DVCS in Jira docs

doc/integration/jira/index.md

@@ -42,7 +42,7 @@ To set up the Jira development panel integration:
 - *If your installation uses Jira Cloud,* use the
   [GitLab for Jira app](connect-app.md).
 - *If either your Jira or GitLab installation is self-managed,* use the
-  [Jira DVCS Connector](dvcs.md).
+  [Jira DVCS (distributed version control system) connector](dvcs.md).
 
 ### Direct feature comparison