IMPALA-5157: [DOCS] Remove sortby() hint from new features
IMPALA-5157: [DOCS] Remove sortby() hint from new features

The writeup for sortby() was removed during the gerrit review
process. This bullet in the New Features list was left behind,
and is now being removed.

Change-Id: Ib0c32df2dcfbde47a16e4692e5953b31cb144bcc
Reviewed-on: http://gerrit.cloudera.org:8080/6965
Reviewed-by: Alex Behm <fe1626037acfc2dc542d2aa723a6d14f2464a20c@cloudera.com>
Tested-by: Impala Public Jenkins

cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala