Fix Javadoc example

Author: garydgregory

src/main/java/org/apache/commons/lang3/CharUtils.java

@@ -230,14 +230,15 @@ public static boolean isAsciiPrintable(final char ch) {
      *
      * <pre>
      *   CharUtils.isHex('0')  = true
+     *   CharUtils.isHex('3')  = true
      *   CharUtils.isHex('9')  = true
      *   CharUtils.isHex('a')  = true
      *   CharUtils.isHex('f')  = true
      *   CharUtils.isHex('g')  = false
      *   CharUtils.isHex('A')  = true
      *   CharUtils.isHex('F')  = true
      *   CharUtils.isHex('G')  = false
-     *   CharUtils.isHex('3')  = false
+     *   CharUtils.isHex('#')  = false
      *   CharUtils.isHex('-')  = false
      *   CharUtils.isHex('\n') = false
      *   CharUtils.isHex('&copy;') = false