add @since for a new method in 1.466

maven-plugin/src/main/java/hudson/maven/MavenModuleSet.java

@@ -818,6 +818,7 @@ public class MavenModuleSet extends AbstractMavenProject<MavenModuleSet,MavenMod
 
     /**
      * Gets the location of top-level <tt>pom.xml</tt> relative to the workspace root.
+     * @since 1.466
      */
     public String getRootPOM(EnvVars env) {
         if (rootPOM == null) return "pom.xml";