[DOCS] Update 3.3 release notes

Include parquet/lz4 in the new features list.

Change-Id: Ib99dc8031ff38634beccde51d07cfb08c00724e1
Reviewed-on: http://gerrit.cloudera.org:8080/14097
Reviewed-by: Alex Rodoni <arodoni@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
diff --git a/docs/topics/impala_new_features.xml b/docs/topics/impala_new_features.xml
index d273e97..fb75078 100644
--- a/docs/topics/impala_new_features.xml
+++ b/docs/topics/impala_new_features.xml
@@ -104,6 +104,11 @@
           from 1 up to 22 are supported. The lower the level, the faster the
           speed at the cost of compression ratio.</p>
       </section>
+      <section id="section_parquet_lz4_notes">
+        <title>Lz4 Compression for Parquet files</title>
+        <p>Lz4 is a lossless compression algorithm providing extremely fast
+            and scalable compression and decompression.</p>
+      </section>
       <section id="section_drv_nxj_s3b">
         <title>Data Cache for Remote Reads</title>
         <p>To improve performance on multi-cluster HDFS environments as well as