improved comments

Author: raydac

jcp/src/main/java/com/igormaznitsa/jcp/gradle/JcpTask.java

@@ -69,8 +69,10 @@ public class JcpTask extends DefaultTask {
   private final Property<String> targetEncoding;
   /**
    * Property contains preprocessor action extension class name or blank string if not provided.
+   * The class must have the default constructor.
    *
    * @since 7.1.2
+   * @see com.igormaznitsa.jcp.extension.PreprocessorExtension
    */
   private final Property<String> actionPreprocessorExtension;
   /**

jcp/src/main/java/com/igormaznitsa/jcp/maven/PreprocessMojo.java

@@ -116,6 +116,7 @@ public class PreprocessMojo extends AbstractMojo implements PreprocessorLogger {
    * Empty string will be recognized as missing class name.
    *
    * @since 7.1.2
+   * @see com.igormaznitsa.jcp.extension.PreprocessorExtension
    */
   @Parameter(alias = "actionPreprocessorExtension", property = "jcp.action.preprocessor.extension", defaultValue = "")
   private String actionPreprocessorExtension = "";