Extend lifecycle handler example (#843)

Server lifecycle has been extended with `didBoot` and `shutdown` events. Extend lifecycle handler example.

docs/advanced/services.md

@@ -82,6 +82,16 @@ struct Hello: LifecycleHandler {
     func willBoot(_ app: Application) throws {
         app.logger.info("Hello!")
     }
+
+    // Called after application boots.
+    func didBoot(_ app: Application) throws {
+        app.logger.info("Server is running")
+    }
+
+    // Called before application shutdown.
+    func shutdown(_ app: Application) {
+        app.logger.info("Goodbye!")
+    }
 }
 
 // Add lifecycle handler.

docs/advanced/services.nl.md

@@ -81,6 +81,16 @@ struct Hello: LifecycleHandler {
     func willBoot(_ app: Application) throws {
         app.logger.info("Hello!")
     }
+
+    // Wordt aangeroepen nadat de applicatie is opgestart.
+    func didBoot(_ app: Application) throws {
+        app.logger.info("Server is running")
+    }
+
+    // Wordt aangeroepen voordat de applicatie wordt afgesloten.
+    func shutdown(_ app: Application) {
+        app.logger.info("Goodbye!")
+    }
 }
 
 // Voeg levenscyclus handler toe.

docs/advanced/services.zh.md

@@ -81,6 +81,16 @@ struct Hello: LifecycleHandler {
     func willBoot(_ app: Application) throws {
         app.logger.info("Hello!")
     }
+
+    // 应用程序启动后调用。
+    func didBoot(_ app: Application) throws {
+        app.logger.info("Server is running")
+    }
+
+    // 在应用程序关闭前调用。
+    func shutdown(_ app: Application) {
+        app.logger.info("Goodbye!")
+    }
 }
 
 // 添加生命周期处理程序。