refine comment for lzw

Author: shellfly

algs4/lzw.py

@@ -4,15 +4,8 @@
  *  Data files:   https://algs4.cs.princeton.edu/55compression/abraLZW.txt
  *                https://algs4.cs.princeton.edu/55compression/ababLZW.txt
  *
- *  Compress or expand binary input from standard input using LZW.
- *
- *  WARNING: STARTING WITH ORACLE JAVA 6, UPDATE 7 the SUBSTRING
- *  METHOD TAKES TIME AND SPACE LINEAR IN THE SIZE OF THE EXTRACTED
- *  SUBSTRING (INSTEAD OF CONSTANT SPACE AND TIME AS IN EARLIER
- *  IMPLEMENTATIONS).
- *
- *  See <a href = "http://java-performance.info/changes-to-string-java-1-7-0_06/">this article</a>
- *  for more details.
+ *  % python lzw.py - < abraLZW.txt | python lzw.py +
+ *  ABRACADBRACRAACRA
  *
 """