Typo - DigestUtils.crypt does not exist [skip ci]

Author: sebbASF

src/main/java/org/apache/commons/codec/digest/UnixCrypt.java

@@ -24,7 +24,7 @@
 /**
  * UNIX crypt(3) algorithm implementation.
  * <p>
- * This class only implements the traditional 56 bit DES based algorithm. Please use DigestUtils.crypt() for a method
+ * This class only implements the traditional 56 bit DES based algorithm. Please use Crypt.crypt() for a method
  * that distinguishes between all the algorithms supported in the current glibc's crypt().
  * </p>
  * <p>