GH-3878: Fix Javadocs for JdbcChannelMessageStore

Resolves https://github.com/spring-projects/spring-integration/issues/3878

**cherry-pick to 5.5.x**

Fix .gitignore

.gitignore

@@ -30,3 +30,4 @@ vf.gf.dmn-*
 /atlassian-ide-plugin.xml
 hostkey.ser
 .springBeans
+.sts4-cache

spring-integration-jdbc/src/main/java/org/springframework/integration/jdbc/store/JdbcChannelMessageStore.java

@@ -61,7 +61,7 @@ import org.springframework.util.StringUtils;
 /**
  * <p>
  * Channel-specific implementation of
- * {@link org.springframework.integration.store.MessageGroupStore} using a relational
+ * {@link org.springframework.integration.store.BasicMessageGroupStore} using a relational
  * database via JDBC.
  *
  * This message store shall be used for message channels only.