Fix typo in comment
Fix typo in comment

Haifeng Liu

(cherry-picked from 58e9f974dcfae7c4c445631afad47d80deb83160)

Author:             Álvaro Hernández Tortosa <f2a78ee48bb80ec86293791e21def221500feff0@8kdata.com>
Date:               Tue Jun 14 00:43:48 UTC 2016

Chibin/gpdb,xuegang/gpdb,cjcjameson/gpdb,Chibin/gpdb,lisakowen/gpdb,janebeckman/gpdb,xuegang/gpdb,rvs/gpdb,lintzc/gpdb,50wu/gpdb,edespino/gpdb,xuegang/gpdb,Quikling/gpdb,yuanzhao/gpdb,rvs/gpdb,yuanzhao/gpdb,greenplum-db/gpdb,Chibin/gpdb,CraigHarris/gpdb,edespino/gpdb,Chibin/gpdb,CraigHarris/gpdb,kaknikhil/gpdb,royc1/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,Chibin/gpdb,kaknikhil/gpdb,CraigHarris/gpdb,50wu/gpdb,kaknikhil/gpdb,cjcjameson/gpdb,xinzweb/gpdb,edespino/gpdb,xuegang/gpdb,50wu/gpdb,kaknikhil/gpdb,xuegang/gpdb,lintzc/gpdb,Chibin/gpdb,jmcatamney/gpdb,janebeckman/gpdb,greenplum-db/gpdb,edespino/gpdb,lintzc/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,rvs/gpdb,lisakowen/gpdb,CraigHarris/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,CraigHarris/gpdb,lintzc/gpdb,yuanzhao/gpdb,lintzc/gpdb,adam8157/gpdb,xinzweb/gpdb,lisakowen/gpdb,lisakowen/gpdb,jmcatamney/gpdb,0x0FFF/gpdb,jmcatamney/gpdb,Chibin/gpdb,ashwinstar/gpdb,adam8157/gpdb,edespino/gpdb,Quikling/gpdb,ashwinstar/gpdb,cjcjameson/gpdb,xinzweb/gpdb,cjcjameson/gpdb,janebeckman/gpdb,janebeckman/gpdb,janebeckman/gpdb,CraigHarris/gpdb,kaknikhil/gpdb,50wu/gpdb,edespino/gpdb,lintzc/gpdb,greenplum-db/gpdb,0x0FFF/gpdb,rvs/gpdb,Quikling/gpdb,0x0FFF/gpdb,lisakowen/gpdb,Quikling/gpdb,rvs/gpdb,greenplum-db/gpdb,lintzc/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,Quikling/gpdb,kaknikhil/gpdb,edespino/gpdb,adam8157/gpdb,greenplum-db/gpdb,edespino/gpdb,janebeckman/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,xinzweb/gpdb,xinzweb/gpdb,royc1/gpdb,ashwinstar/gpdb,adam8157/gpdb,Quikling/gpdb,royc1/gpdb,0x0FFF/gpdb,0x0FFF/gpdb,greenplum-db/gpdb,xuegang/gpdb,yuanzhao/gpdb,adam8157/gpdb,greenplum-db/gpdb,Chibin/gpdb,xinzweb/gpdb,xuegang/gpdb,50wu/gpdb,xinzweb/gpdb,ashwinstar/gpdb,xuegang/gpdb,lisakowen/gpdb,50wu/gpdb,rvs/gpdb,CraigHarris/gpdb,janebeckman/gpdb,adam8157/gpdb,CraigHarris/gpdb,ashwinstar/gpdb,Quikling/gpdb,janebeckman/gpdb,lisakowen/gpdb,jmcatamney/gpdb,lisakowen/gpdb,royc1/gpdb,edespino/gpdb,yuanzhao/gpdb,janebeckman/gpdb,CraigHarris/gpdb,0x0FFF/gpdb,kaknikhil/gpdb,xinzweb/gpdb,cjcjameson/gpdb,Quikling/gpdb,cjcjameson/gpdb,edespino/gpdb,50wu/gpdb,yuanzhao/gpdb,royc1/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,rvs/gpdb,royc1/gpdb,50wu/gpdb,Quikling/gpdb,Quikling/gpdb,lintzc/gpdb,Chibin/gpdb,cjcjameson/gpdb,adam8157/gpdb,Chibin/gpdb,yuanzhao/gpdb,yuanzhao/gpdb,adam8157/gpdb,rvs/gpdb,0x0FFF/gpdb,royc1/gpdb,rvs/gpdb,0x0FFF/gpdb,janebeckman/gpdb,royc1/gpdb,lintzc/gpdb,cjcjameson/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,xuegang/gpdb,rvs/gpdb