doc: fix link for cephfs helm doc

fix the doc link for cephfs helm
readme.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

Author: Madhu-1

docs/cephfs/deploy.md

@@ -221,7 +221,7 @@ The Helm chart is located in `charts/ceph-csi-cephfs`.
 
 **Deploy Helm Chart:**
 
-[See the Helm chart readme for installation instructions.](../charts/ceph-csi-cephfs/README.md)
+[See the Helm chart readme for installation instructions.](../../../charts/ceph-csi-cephfs/README.md)
 
 ## Read Affinity using crush locations for CephFS subvolumes