我需要一个关于 Deployment 的 Kubernetes 配置文件样例，这将用于部署一个 Web 应用，并能够确保永远至少有两个副本在运行。请给出满足此需求的 YAML 格式代码。
user
```yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-app-deployment
spec:
  replicas: 2
  minReadySeconds: 30
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
  selector:
    matchLabels:
      app: web-app
  template:
    metadata:
      labels:
        app: web-app
    spec:
      containers:
      - name: web-app
        image: your-web-app-image:latest
        ports:
        - containerPort: 8080
        livenessProbe:
          httpGet:
            path: /health
            port: 8080
          initialDelaySeconds: 30
          periodSeconds: 10
        readinessProbe:
          httpGet:
            path: /ready
            port: 8080
          initialDelaySeconds: 5
          periodSeconds: 10
```
assistant