site: fix label selector for kubectl wait command (#1935)

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Signed-off-by: King Ye <kingye.me@gmail.com>
Co-authored-by: Ignasi Barrera <ignasi@tetrate.io>

Author: ikingye

site/docs/capabilities/observability/tracing.md

@@ -50,7 +50,7 @@ helm install phoenix oci://registry-1.docker.io/arizephoenix/phoenix-helm \
 
 # Wait for Phoenix to be ready (first run may take a few minutes to pull images)
 kubectl wait --timeout=5m -n envoy-ai-gateway-system \
-  pods -l app.kubernetes.io/name=phoenix --for=condition=Ready
+  pods -l app=phoenix --for=condition=Ready
 ```
 
 ### Configure AI Gateway with OpenTelemetry