reno: polish release notes for Xena

Change-Id: I748fb3fa259303a89ef2615a37299360bcf11545

releasenotes/notes/add-masakari-dashboard-eae5f216888e5fe0.yaml

@@ -1,3 +1,3 @@
 ---
 features:
-  - Add masakari-dashboard to debian binary horizon image.
+  - Add masakari-dashboard to Debian binary Horizon image.

releasenotes/notes/bug-1933770-c08c6804aa5d9e61.yaml

@@ -1,6 +1,6 @@
 ---
 fixes:
   - |
-    Fixes debian image build failure caused by the official
+    Fixes Debian image build failure caused by the official
     Debian bullseye release changing the os identification.
     `LP#1933770 <https://launchpad.net/bugs/1933770>`__

releasenotes/notes/bug-1934753-98ec4951a0f7373b.yaml

@@ -2,5 +2,5 @@
 fixes:
   - |
     Fixes user uid inconsistency beetween base and openstack-base
-    debian binary images.
+    Debian binary images.
     `LP#1934753 <https://bugs.launchpad.net/kolla/+bug/1934753>`__

releasenotes/notes/debian-bullseye-4fedf3b3638783de.yaml

@@ -1,6 +1,6 @@
 ---
 features:
   - |
-    Debian 'bullseye' is now used instead of 'buster'. Bullseye is the next
-    stable release of Debian, and is currently in a 'freeze' state. Several
-    images gained Debian support with the move to bullseye.
+    Debian 'bullseye' is now used instead of 'buster'. Bullseye is the current
+    stable release of Debian. Several images gained Debian support with this
+    move.

releasenotes/notes/deprecate-ppc64le-2b7b642e79bddd66.yaml

@@ -2,4 +2,4 @@
 deprecations:
   - |
     Support for building ppc64le container images has been deprecated in
-    Wallaby cycle and will be removed in Xena.
+    Wallaby cycle and got removed in Xena.

releasenotes/notes/deprecate-tempest-and-rally-0647efa7209cf03a.yaml

@@ -1,7 +1,6 @@
 ---
 deprecations:
   - |
-    The ``tempest`` and ``rally`` images are deprecated and will be
-    removed in the Xena cycle.
+    The ``tempest`` and ``rally`` images were removed in the Xena cycle.
     The reason is that these are not services of an OpenStack cloud but
     its clients.

releasenotes/notes/ovn-debian-x86-d584f88b9e94b226.yaml

@@ -1,4 +1,4 @@
 ---
 features:
   - |
-    OVN images are now buildable for Debian x86.
+    OVN images are now buildable for Debian on x86-64 architecture.

releasenotes/notes/ubuntu-mariadb-10.5-38631eae76f6d091.yaml

@@ -1,4 +1,4 @@
 ---
-other:
+upgrade:
   - |
     Ubuntu now uses MariaDB 10.5 to sync with Debian.