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docs: modify how-eureka-enable-service-discovery-and-service-registration.md (#319)

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Zane
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docs/micro-services/how-eureka-enable-service-discovery-and-service-registration.md
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@@ -48,7 +48,7 @@ At Netflix, Eureka is used for the following purposes apart from playing a criti
### 服务续约（Renew）
服务续约会由服务提供者（比如 `Demo` 中的 `service-provider` ）定期调用，类似于心跳，用来告知注册中心 `Eureka Server` 自己的状态，避免被 `Eureka Server` 认为服务时效将其剔除下线。服务续约就是发送一个 `PUT` 请求带上当前实例信息到类 `InstanceResource` 的 `renewLease` 方法进行服务续约操作。
服务续约会由服务提供者（比如 `Demo` 中的 `service-provider` ）定期调用，类似于心跳，用来告知注册中心 `Eureka Server` 自己的状态，避免被 `Eureka Server` 认为服务失效将其剔除下线。服务续约就是发送一个 `PUT` 请求带上当前实例信息到类 `InstanceResource` 的 `renewLease` 方法进行服务续约操作。
![eureka-server-instanceresource-renew.png](./images/eureka-server-instanceresource-renew.png)