docs: exhaustively list all priority class options

List all possible config values for listing
PriorityClasses in CephCluster CRD.

Signed-off-by: Tarun Gupta Akirala <tarun.akirala@nutanix.com>
(cherry picked from commit 48ab3d774f)

Documentation/CRDs/Cluster/ceph-cluster-crd.md

@@ -559,6 +559,8 @@ You can set priority class names for Rook components for the list of key value p
 * `mon`: Set priority class names for Mons. Examples default to system-node-critical.
 * `osd`: Set priority class names for OSDs. Examples default to system-node-critical.
 * `crashcollector`: Set priority class names for crashcollectors.
+* `exporter`: Set priority class names for exporters.
+* `cleanup`: Set priority class names for cleanup Jobs.
 
 The specific component keys will act as overrides to `all`.