docs(charts): Update instructions of Spin-Operator helm chart

This commit updates the notes being displayed after installing the Spin Operator helm chart. It instructs users to apply both: the SpinAppExecutor and the RuntimeClass from the GitHub tag instead of using release artifacts. Before this commit, users are asked to apply the SpinAppExecutor using a non-existent release artifact

Signed-off-by: Thorsten Hans <thorsten.hans@fermyon.com>

charts/spin-operator/templates/NOTES.txt

@@ -12,11 +12,11 @@ Kubernetes cluster before it can run the first Spin application.
 
 1. Install the containerd-shim-spin SpinAppExecutor:
 
-  $ kubectl apply -f https://github.com/spinkube/spin-operator/releases/download/{{ .Chart.AppVersion }}/spin-operator.executor.yaml
+  $ kubectl apply -f https://raw.githubusercontent.com/spinkube/spin-operator/{{ .Chart.AppVersion }}/config/samples/spin-shim-executor.yaml
 
 2. Install the wasmtime-spin-v2 RuntimeClass:
 
-  $ kubectl apply -f https://github.com/spinkube/spin-operator/releases/download/{{ .Chart.AppVersion }}/spin-operator.runtime-class.yaml
+  $ kubectl apply -f https://raw.githubusercontent.com/spinkube/spin-operator/{{ .Chart.AppVersion }}/config/samples/spin-runtime-class.yaml
 
 3. Finally, install the containerd wasm shim on at least one node. This shim is
 necessary for running Spin application workloads. We use the Kwasm Operator