Release notes ha composable

Add some release notes about the composable ha work

Change-Id: I8975c3f597d1affbe6e52d4e16a2aad527006264

diff --git a/releasenotes/notes/composable-ha-37e2d7e1f57f5c10.yaml b/releasenotes/notes/composable-ha-37e2d7e1f57f5c10.yaml
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+++ b/releasenotes/notes/composable-ha-37e2d7e1f57f5c10.yaml
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+---
+features:
+  - With the composable HA work landed it is now possible
+    to split pacemaker-managed services like galera, rabbit,
+    redis, haproxy and any A/P resource, off to dedicated
+    nodes. These services can be split off to separate nodes
+    either via the normal Pacemaker service (which has a limit
+    of 16 maximum number of nodes) or via the newer PacemakerRemote
+    service (but not both on the same node). Note that until
+    https://bugzilla.redhat.com/show_bug.cgi?id=1417936 is fixed,
+    PacemakerRemote should only be used for Cinder A/P resources
+    and Manila A/P resources.