Update ref docs

- First set of changes for doc updates for M3
- Relates #88

spring-statemachine-samples/persist/src/main/java/demo/persist/Application.java

@@ -67,6 +67,7 @@ public class Application  {
 	}
 //end::snippetA[]
 
+//tag::snippetB[]
 	@Configuration
 	static class PersistHandlerConfig {
 
@@ -84,7 +85,9 @@ public class Application  {
 		}
 
 	}
+//end::snippetB[]
 
+//tag::snippetC[]
 	public static class Order {
 		int id;
 		String state;
@@ -100,6 +103,7 @@ public class Application  {
 		}
 
 	}
+//end::snippetC[]
 
 	public static void main(String[] args) throws Exception {
 		Bootstrap.main(args);

spring-statemachine-samples/persist/src/main/java/demo/persist/Persist.java

@@ -36,8 +36,10 @@ public class Persist {
 
 	private final PersistStateMachineHandler handler;
 
+//tag::snippetA[]
 	@Autowired
 	private JdbcTemplate jdbcTemplate;
+//end::snippetA[]
 
 	private final PersistStateChangeListener listener = new LocalPersistStateChangeListener();
 
@@ -62,6 +64,7 @@ public class Persist {
 		return buf.toString();
 	}
 
+//tag::snippetB[]
 	public void change(int order, String event) {
 		Order o = jdbcTemplate.queryForObject("select id, state from orders where id = ?", new Object[]{order}, new RowMapper<Order>() {
             public Order mapRow(ResultSet rs, int rowNum) throws SQLException {
@@ -70,7 +73,9 @@ public class Persist {
         });
 		handler.handleEventWithState(MessageBuilder.withPayload(event).setHeader("order", order).build(), o.state);
 	}
+//end::snippetB[]
 
+//tag::snippetC[]
 	private class LocalPersistStateChangeListener implements PersistStateChangeListener {
 
 		@Override
@@ -82,5 +87,6 @@ public class Persist {
 			}
 		}
 	}
+//end::snippetC[]
 
 }