Fix syntax: revert to using curly braces in hosted service definitions

Author: devin-ai-integration[bot]

showcases/data/Lambda/Activator - Hosted service/code.pure

@@ -15,7 +15,7 @@ function model::processData(data: String[1]): String[1]
 HostedService model::BasicHostedService
 {
   pattern: '/api/greet/{name}';
-  ownership: UserList [ users: ['user1', 'user2'] ];
+  ownership: UserList {users: ['user1', 'user2']};
   function: model::greet(String[1]):String[1];
   documentation: 'A simple hosted service that greets users by name';
   autoActivateUpdates: true;
@@ -25,7 +25,7 @@ HostedService model::BasicHostedService
 HostedService <<meta::pure::profiles::doc.doc>> {doc.doc='Example with deployment ownership'} model::DeploymentHostedService
 {
   pattern: '/api/process/{data}';
-  ownership: Deployment [ identifier: '12345' ];
+  ownership: Deployment {identifier: '12345'};
   function: model::processData(String[1]):String[1];
   documentation: 'A hosted service that processes data with deployment ownership';
   autoActivateUpdates: false;
@@ -35,16 +35,16 @@ HostedService <<meta::pure::profiles::doc.doc>> {doc.doc='Example with deploymen
 HostedService model::AdvancedHostedService
 {
   pattern: '/api/advanced/{param}';
-  ownership: UserList [ users: ['admin'] ];
+  ownership: UserList {users: ['admin']};
   function: model::processData(String[1]):String[1];
   documentation: 'Advanced hosted service with post-deployment actions';
   autoActivateUpdates: true;
   actions:
-  [
+  {
     SlackNotify
-    [
+    {
       channel: '#deployments';
       message: 'Hosted service has been deployed';
-    ]
-  ]
+    }
+  }
 }