Merge pull request #8439 from cemsbr/fix-teardown-docs

docs: fix command to remove cluster CRD finalizer

Documentation/ceph-teardown.md

@@ -153,7 +153,7 @@ If for some reason the operator is not able to remove the finalizer (ie. the ope
 ```console
 for CRD in $(kubectl get crd -n rook-ceph | awk '/ceph.rook.io/ {print $1}'); do
     kubectl get -n rook-ceph "$CRD" -o name | \
-    xargs -I {} kubectl patch {} --type merge -p '{"metadata":{"finalizers": [null]}}'
+    xargs -I {} kubectl patch -n rook-ceph {} --type merge -p '{"metadata":{"finalizers": [null]}}'
 done
 ```