added appendArray function

src/main/java/strman/Strman.java

@@ -12,13 +12,19 @@ public interface Strman {
      * Appends Strings to value
      *
      * @param value   initial String
-     * @param appends -- an array of strings to append
-     * @return full string
+     * @param appends an array of strings to append
+     * @return full String
      */
     static String append(final String value, final String... appends) throws IllegalArgumentException {
         return appendArray(value, appends);
     }
 
+    /**
+     * Append an array of String to value
+     * @param value initial String
+     * @param appends an array of strings to append
+     * @return full String
+     */
     static String appendArray(String value, String[] appends) {
         if (value == null) {
             throw new IllegalArgumentException("'value' should be not null.");