(DOCSP-38674) Add rel note link. (#180)

[JIRA](https://jira.mongodb.org/browse/DOCSP-38674)
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Log](https://workerpool-boxgs.mongodbstitch.com/pages/job.html?collName=queue&jobId=661974103a5920a2919db272)

[Staging](https://preview-mongodblmkerbeymdb.gatsbyjs.io/ops-manager/DOCSP-38674-70/release-notes/application/)

Author: lmkerbey-mdb

source/release-notes/changelogs/ops-manager/changelog-onprem-v7.0.rst

@@ -7,7 +7,8 @@
 
 - Releases {+mongosh+} 2.2.3 to |onprem|. To learn more, see {+mongosh+} 
   Release Notes.
-- Supports enabling and configuring regional backups.
+- Supports enabling and configuring :ref:`regional backups
+  <deployment-regions-interface>`.
 - Supports ``net.tls.clusterAuthX509`` parameter in MongoDB 7.0 for
   ``clusterAuthMode`` set to ``x509``. 
 - Adds API support for project level MongoDB :ref:`log rotation