PendingReleaseNote: add note for pause_purging and pause_cloninig

Added release notes for mgr/vol config option "pause_purging and
"pause_cloning".

Signed-off-by: Rishabh Dave <[email protected]>

Author: rishabh-d-dave

PendingReleaseNotes

@@ -48,6 +48,13 @@
   This can be necessary in cases where we wish to prevent the manager from being
   flooded by module commands when Ceph services are down or degraded.
 
+* CephFS: It is now possible to pause the threads that asynchronously purge
+  the deleted subvolumes by using the config option
+  "mgr/volumes/pause_purging".
+* CephFS: It is now possible to pause the threads that asynchronously clone
+  the subvolume snapshots by using the config option
+  "mgr/volumes/pause_cloning".
+
 * CephFS: Modifying the setting "max_mds" when a cluster is
   unhealthy now requires users to pass the confirmation flag
   (--yes-i-really-mean-it). This has been added as a precaution to tell the