ZmtLibraryPlugin.groovy: small fixes in documentation

src/main/groovy/de/zmt/gradle/ZmtLibraryPlugin.groovy

@@ -2,8 +2,8 @@ package de.zmt.gradle;
 
 import org.gradle.api.*
 
-/*
- * Meta plugin applying all necessary plugins for ZMT libraries
+/**
+ * Meta plugin applying all necessary plugins for ZMT libraries.
  */
 public class ZmtLibraryPlugin implements Plugin<Project> {
     private static final def CONFIGURE = {
@@ -18,4 +18,4 @@ public class ZmtLibraryPlugin implements Plugin<Project> {
     void apply(Project project) {
         project.configure(project, CONFIGURE)
     }
-}    
+}