docs: update deployment example

docs/install/kuberntes-advanced.md

@@ -61,6 +61,12 @@ spec:
   gatewayVersion: latest # 0.2.2
   ## Server config
   server:
+     ## Kubernetes tls secret name
+    #tlsSecretName: tls-secret
+# Redis configs for distributed rate limiting across multiple instances
+#    redis:
+#        addr: redis:6379
+#        password: password
     writeTimeout: 10
     readTimeout: 15
     idleTimeout: 30