[Lucene-java Wiki] Update of "ReleaseNote42" by jpountz

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The "ReleaseNote42" page has been changed by jpountz:
http://wiki.apache.org/lucene-java/ReleaseNote42?action=diff&rev1=3&rev2=4

Comment:
improved description of term vectors compression

  {{{
- January 2013, Apache Lucene™ 4.2 available
+ March 2013, Apache Lucene™ 4.2 available
  The Lucene PMC is pleased to announce the release of Apache Lucene 4.2
  
  Apache Lucene is a high-performance, full-featured text search engine
@@ -20, +20 @@

  
   * Lucene 4.2 has a new default codec (Lucene42Codec) with a more
     efficient docvalues format (sorted bytes in FST, less addressing
-    overhead, improved numeric compression) and LZ4-compressed term
+    overhead, improved numeric compression) and smaller term
-    vectors.
+    vectors (LZ4-compressed terms dictionaries and payloads, delta-encoded
+    positions and offsets using blocks of packed integers).
  
   * Doc values external and codec API and implementations have been
     simplified: the codec is no longer responsible for buffering doc