Update service filter doc example

This commit updates the code example in service filter section of
the docs how to filter out the "health service" and "reflection service"
which might be more useful (e.g. for the in-process server).

See #207

Signed-off-by: Chris Bono <[email protected]>

Author: onobc

spring-grpc-docs/src/main/antora/modules/ROOT/pages/server.adoc

@@ -17,14 +17,15 @@ The easiest way to activate it is to simply add a Spring `@Service` annotation t
 All available `BindableService` beans are bound to all running gRPC servers.
 However, you can register a `ServerServiceDefinitionFilter` bean to decide which services are bound to which server factories.
 
-The following example prevents the `my-unwanted-service` service from being applied to any servers created by the server factory that the filter is applied to.
+The following example prevents the "health" and "reflection" service from being bound to the server created by the server factory that the filter is applied to (e.g. the `InProcessGrpcServerFactory`).
 
 [source,java]
 ----
 @Bean
 ServerServiceDefinitionFilter myServiceFilter() {
-	return (serviceDefinition, __) ->
-			!(serviceDefinition.getServiceDescriptor().getName().equals("my-unwanted-service"));
+    return (serviceDefinition, __) ->
+            !Set.of(HealthGrpc.SERVICE_NAME, ServerReflectionGrpc.SERVICE_NAME)
+                    .contains(serviceDefinition.getServiceDescriptor().getName());
 }
 ----