Update javadoc

Author: jmrozanec

src/main/java/com/cronutils/model/definition/CronDefinitionBuilder.java

@@ -125,7 +125,7 @@ public CronDefinitionBuilder matchDayOfWeekAndDayOfMonth() {
 
     /**
      * Adds a cron validation.
-     *
+     * @param validation - constraint validation
      * @return this CronDefinitionBuilder instance
      */
     public CronDefinitionBuilder withCronValidation(final CronConstraint validation) {

src/main/java/com/cronutils/utils/StringUtils.java

@@ -227,8 +227,8 @@ public static boolean isNumeric(final CharSequence cs) {
      * StringUtils.join([null, "", "a"], ',')   = "null,,a"
      * </pre>
      *
-     * @param array     the array of values to join together, may be null
-     * @param separator the separator character to use, null treated as ""
+     * @param parts - the array of values to join together, may be null
+     * @param separator - the separator character to use, null treated as ""
      * @return the joined String, {@code null} if null array input
      */
     public static String join(final Object[] parts, final String separator) {