[examples] Remove old Spring example demo-service

.github/workflows/jvm-compatibility.yml

@@ -150,7 +150,6 @@ jobs:
               examples/client-v2-apache-arrow/pom.xml
               examples/client-v2-json-processors/pom.xml
               examples/demo-kotlin-service/pom.xml
-              examples/demo-service/pom.xml
               examples/jdbc-v2-json-processors/pom.xml
             )
           fi

README.md

@@ -88,7 +88,7 @@ Nightly Builds: https://s01.oss.sonatype.org/content/repositories/snapshots/com/
 
 [Begin-with Usage Examples](../../tree/main/examples/client-v2)
 
-[Spring Demo Service](https://github.com/ClickHouse/clickhouse-java/tree/main/examples/demo-service) 
+[Spring Demo Service](https://github.com/ClickHouse/clickhouse-java/tree/main/examples/demo-spring-service)
 
 
 ## JDBC Driver

docs/clickhouse-docs/client.mdx

@@ -825,7 +825,7 @@ This object should be closed as soon as possible to release a connection because
 ### Examples {#examples}
 
 - Example code is available in [repo](https://github.com/ClickHouse/clickhouse-java/tree/main/examples/client-v2)
-- Reference Spring Service [implementation](https://github.com/ClickHouse/clickhouse-java/tree/main/examples/demo-service)
+- Reference Spring Service [implementation](https://github.com/ClickHouse/clickhouse-java/tree/main/examples/demo-spring-service)
 
 ## Common API {#common-api}
 
@@ -898,7 +898,7 @@ client.register(ArticleViewEvent.class, client.getTableSchema(TABLE_NAME));
 Complete examples code is stored in the repo in a 'example` [folder](https://github.com/ClickHouse/clickhouse-java/tree/main/examples):
 
 - [client-v2](https://github.com/ClickHouse/clickhouse-java/tree/main/examples/client-v2) - main set of examples.
-- [demo-service](https://github.com/ClickHouse/clickhouse-java/tree/main/examples/demo-service) - example of how to use the client in a Spring Boot application.
+- [demo-spring-service](https://github.com/ClickHouse/clickhouse-java/tree/main/examples/demo-spring-service) - example of how to use the client and the JDBC driver in a Spring Boot application, with observability.
 - [demo-kotlin-service](https://github.com/ClickHouse/clickhouse-java/tree/main/examples/demo-kotlin-service) - example of how to use the client in Ktor (Kotlin) application.
 
 ## Reading Data {#reading-data}