doc: Correct the ceph config path

Fixes the ceph config file path and the file name
in the deploy-rbd doc.

Signed-off-by: karthik-us <ksubrahm@redhat.com>

docs/deploy-rbd.md

@@ -134,7 +134,7 @@ for more information.
 **Deploy Ceph configuration ConfigMap for CSI pods:**
 
 ```bash
-kubectl create -f ../example/ceph-config.yaml
+kubectl create -f ../../../examples/ceph-conf.yaml
 ```
 
 **Deploy CSI sidecar containers:**