Fix CHANGES.txt for TEZ-2924/TEZ-2928
Fix CHANGES.txt for TEZ-2924/TEZ-2928

ChetnaChaudhari/tez,apache/tez,apache/tez,sidseth/tez,ChetnaChaudhari/tez,ueshin/apache-tez,ChetnaChaudhari/tez,apache/tez,apache/tez,sidseth/tez,ChetnaChaudhari/tez,ueshin/apache-tez,ueshin/apache-tez,sidseth/tez,ChetnaChaudhari/tez,sidseth/tez,ueshin/apache-tez,ueshin/apache-tez,apache/tez,sidseth/tez