Fixing NumberUtils JAVADoc of the following methods


Fixing NumberUtils comments of the following methods:
* `public static long max(final long[] array)`
* `public static long max(final int[] array)`
* `public static long max(final short[] array)`
* `public static long max(final byte[] array)`
* `public static long max(final double[] array)`
* `public static long max(final float[] array)`