(DOCSP-45257) Update release notes (#531)

- [DOCSP-45257](https://jira.mongodb.org/browse/DOCSP-45257)
- [STAGING: 7.0.12 Release
Notes](https://deploy-preview-531--10gen-docs-ops-manager.netlify.app/release-notes/application/#onprem-server-7.0.12)
- [STAGING: 5.0.21 Release
Notes](https://deploy-preview-531--10gen-docs-ops-manager.netlify.app/release-notes/application/#onprem-server-5.0.21)

@aakash-kadam this is ready for your review.

(cherry picked from commit 2a5aa33)

Author: JuliaMongo

source/release-notes/changelogs/ops-manager/changelog-onprem-v5.0.rst

@@ -37,6 +37,8 @@
   during backup to :guilabel:`On`.
 - Snapshots now include a flag that indicates whether or not they are incremental.
 - Fixes `CVE-2023-0342 <https://nvd.nist.gov/vuln/detail/CVE-2023-0342>`__.
+- Fixes a bug in the MongoDB Agent where the shutdown sequence might get
+  blocked under certain circumstances, resulting in failed Agent upgrades.
 
 .. _opsmgr-server-5.0.20:
 

source/release-notes/changelogs/ops-manager/changelog-onprem-v6.0.rst

@@ -425,6 +425,8 @@
 - Adds support for managing MongoDB deployments on the Ubuntu 22.04 (x86) operating system.
   BI Connector is not currently supported on the Ubuntu 22.04 (x86) operating system.
 - Fixes `CVE-2023-0342 <https://nvd.nist.gov/vuln/detail/CVE-2023-0342>`__.
+- Fixes a bug in the MongoDB Agent where the shutdown sequence might get
+  blocked under certain circumstances, resulting in failed Agent upgrades.
 
 .. _opsmgr-server-6.0.11: