adds final note

Signed-off-by: Chris Burns <29541485+ChrisJBurns@users.noreply.github.com>

Author: ChrisJBurns

docs/toolhive/guides-k8s/deploy-operator.mdx

@@ -53,6 +53,10 @@ helm upgrade --install toolhive-operator-crds oci://ghcr.io/stacklok/toolhive/to
   -n toolhive-system --create-namespace
 ```
 
+If you do want to install into a separate namespace, you'll need to modify the
+annotations of the existing installed CRDs. See below in the Troubleshooting
+section for example `kubectl annotate` commands.
+
 :::
 
 This command installs the latest version of the ToolHive operator CRDs Helm